From 79ead28491a82ce9b2542c40a38233810eac2e5f Mon Sep 17 00:00:00 2001
From: irengrig <Irina.Chernushina@jetbrains.com>
Date: Mon, 1 Nov 2010 13:43:38 +0300
Subject: [PATCH] VCS: line status tracker installing/removing fix. All changes
 to line status trackers model (that in LineStatusTrackerManager) will be done
 under write action. + dummy implementation if lst is forbidden. + just
 translate into current line in VCS annotation, no false tracker creation. +
 fix for "Diff for change" when last symbol in line is added

---
 .../src/componentSets/VCS.xml                 |   1 +
 .../vcs/actions/ShowChangeMarkerAction.java   |   4 +-
 .../vcs/ex/BaseLineStatusRangeAction.java     |  42 ++
 .../vcs/ex/CopyLineStatusRangeAction.java     |  41 ++
 .../openapi/vcs/ex/DocumentWrapper.java       |   7 +-
 .../openapi/vcs/ex/LineStatusTracker.java     | 692 +++++-------------
 .../vcs/ex/LineStatusTrackerDrawing.java      | 250 +++++++
 .../com/intellij/openapi/vcs/ex/Range.java    |   7 +-
 .../openapi/vcs/ex/RangesBuilder.java         |   9 +-
 .../vcs/ex/RollbackLineStatusRangeAction.java |  52 ++
 .../vcs/ex/ShowLineStatusRangeDiffAction.java |  74 ++
 .../vcs/impl/LineStatusTrackerManager.java    | 441 ++++++-----
 .../vcs/impl/LineStatusTrackerManagerI.java   |  38 +
 .../impl/UpToDateLineNumberProviderImpl.java  |   2 +-
 14 files changed, 933 insertions(+), 727 deletions(-)
 create mode 100644 platform/vcs-impl/src/com/intellij/openapi/vcs/ex/BaseLineStatusRangeAction.java
 create mode 100644 platform/vcs-impl/src/com/intellij/openapi/vcs/ex/CopyLineStatusRangeAction.java
 create mode 100644 platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTrackerDrawing.java
 create mode 100644 platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RollbackLineStatusRangeAction.java
 create mode 100644 platform/vcs-impl/src/com/intellij/openapi/vcs/ex/ShowLineStatusRangeDiffAction.java
 create mode 100644 platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManagerI.java

diff --git a/platform/platform-resources/src/componentSets/VCS.xml b/platform/platform-resources/src/componentSets/VCS.xml
index e0c79f9198d1..4d3c97aa1ab8 100644
--- a/platform/platform-resources/src/componentSets/VCS.xml
+++ b/platform/platform-resources/src/componentSets/VCS.xml
@@ -27,6 +27,7 @@
       <implementation-class>com.intellij.openapi.vcs.impl.VcsDirectoryMappingStorage</implementation-class>
     </component>
     <component>
+      <interface-class>com.intellij.openapi.vcs.impl.LineStatusTrackerManagerI</interface-class>
       <implementation-class>com.intellij.openapi.vcs.impl.LineStatusTrackerManager</implementation-class>
       <option name="workspace" value="true"/>
       <skipForDefaultProject/>
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/actions/ShowChangeMarkerAction.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/actions/ShowChangeMarkerAction.java
index ffd9d5e87984..113762962af4 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/actions/ShowChangeMarkerAction.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/actions/ShowChangeMarkerAction.java
@@ -20,6 +20,7 @@ import com.intellij.openapi.actionSystem.Presentation;
 import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vcs.ex.LineStatusTracker;
+import com.intellij.openapi.vcs.ex.LineStatusTrackerDrawing;
 import com.intellij.openapi.vcs.ex.Range;
 import com.intellij.openapi.vcs.impl.LineStatusTrackerManager;
 
@@ -92,7 +93,8 @@ public abstract class ShowChangeMarkerAction extends AbstractVcsAction {
     LineStatusTracker lineStatusTracker = myChangeMarkerContext.getLineStatusTracker(context);
     Range range = myChangeMarkerContext.getRange(context);
 
-    lineStatusTracker.moveToRange(range, editor);
+
+    LineStatusTrackerDrawing.moveToRange(range, editor, lineStatusTracker);
   }
 
   protected interface ChangeMarkerContext {
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/BaseLineStatusRangeAction.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/BaseLineStatusRangeAction.java
new file mode 100644
index 000000000000..aaa16af64ebd
--- /dev/null
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/BaseLineStatusRangeAction.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.vcs.ex;
+
+import com.intellij.openapi.actionSystem.AnAction;
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.project.DumbAware;
+
+import javax.swing.*;
+
+/**
+* @author irengrig
+*/
+public abstract class BaseLineStatusRangeAction extends AnAction implements DumbAware {
+  protected final LineStatusTracker myLineStatusTracker;
+  protected final Range myRange;
+
+  BaseLineStatusRangeAction(final String text, final Icon icon, final LineStatusTracker lineStatusTracker, final Range range) {
+    super(text, null, icon);
+    myLineStatusTracker = lineStatusTracker;
+    myRange = range;
+  }
+
+  public void update(final AnActionEvent e) {
+    e.getPresentation().setEnabled(isEnabled());
+  }
+
+  public abstract boolean isEnabled();
+}
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/CopyLineStatusRangeAction.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/CopyLineStatusRangeAction.java
new file mode 100644
index 000000000000..b26db069df84
--- /dev/null
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/CopyLineStatusRangeAction.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.vcs.ex;
+
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.ide.CopyPasteManager;
+import com.intellij.openapi.util.IconLoader;
+import com.intellij.openapi.vcs.VcsBundle;
+
+import java.awt.datatransfer.StringSelection;
+
+/**
+* @author irengrig
+*/
+public class CopyLineStatusRangeAction extends BaseLineStatusRangeAction {
+  CopyLineStatusRangeAction(final LineStatusTracker lineStatusTracker, final Range range) {
+    super(VcsBundle.message("action.name.copy.old.text"), IconLoader.getIcon("/actions/copy.png"), lineStatusTracker, range);
+  }
+
+  public boolean isEnabled() {
+    return Range.DELETED == myRange.getType() || Range.MODIFIED == myRange.getType();
+  }
+
+  public void actionPerformed(final AnActionEvent e) {
+    final String content = myLineStatusTracker.getUpToDateContent(myRange);
+    CopyPasteManager.getInstance().setContents(new StringSelection(content));
+  }
+}
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/DocumentWrapper.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/DocumentWrapper.java
index 3e10ad1be452..c74188166afe 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/DocumentWrapper.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/DocumentWrapper.java
@@ -16,6 +16,7 @@
 package com.intellij.openapi.vcs.ex;
 
 import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.util.TextRange;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -53,10 +54,8 @@ public class DocumentWrapper {
     return result;
   }
 
-  private String getLine(int i) {
-    int lineStartOffset = myDocument.getLineStartOffset(i);
-    String line = myDocument.getCharsSequence().subSequence(lineStartOffset, myDocument.getLineEndOffset(i)).toString();
-    return line;
+  private String getLine(final int i) {
+    return myDocument.getText(new TextRange(myDocument.getLineStartOffset(i), myDocument.getLineEndOffset(i)));
   }
 }
 
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTracker.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTracker.java
index 4218942fe8a6..3e7d1125997f 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTracker.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTracker.java
@@ -15,135 +15,111 @@
  */
 package com.intellij.openapi.vcs.ex;
 
-import com.intellij.codeInsight.hint.EditorFragmentComponent;
-import com.intellij.codeInsight.hint.HintManagerImpl;
-import com.intellij.openapi.actionSystem.*;
+import com.intellij.openapi.application.Application;
 import com.intellij.openapi.application.ApplicationManager;
-import com.intellij.openapi.command.CommandProcessor;
 import com.intellij.openapi.command.undo.UndoManager;
 import com.intellij.openapi.diagnostic.Logger;
-import com.intellij.openapi.diff.*;
 import com.intellij.openapi.editor.Document;
-import com.intellij.openapi.editor.Editor;
 import com.intellij.openapi.editor.EditorFactory;
-import com.intellij.openapi.editor.ScrollType;
-import com.intellij.openapi.editor.colors.EditorColors;
-import com.intellij.openapi.editor.colors.EditorColorsManager;
-import com.intellij.openapi.editor.colors.EditorColorsScheme;
-import com.intellij.openapi.editor.colors.TextAttributesKey;
 import com.intellij.openapi.editor.event.DocumentAdapter;
 import com.intellij.openapi.editor.event.DocumentEvent;
-import com.intellij.openapi.editor.ex.DocumentEx;
-import com.intellij.openapi.editor.ex.EditorEx;
-import com.intellij.openapi.editor.ex.EditorGutterComponentEx;
-import com.intellij.openapi.editor.highlighter.EditorHighlighter;
-import com.intellij.openapi.editor.highlighter.EditorHighlighterFactory;
 import com.intellij.openapi.editor.markup.*;
 import com.intellij.openapi.fileEditor.FileDocumentManager;
-import com.intellij.openapi.ide.CopyPasteManager;
-import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.project.Project;
-import com.intellij.openapi.util.IconLoader;
+import com.intellij.openapi.util.Computable;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.openapi.vcs.VcsBundle;
-import com.intellij.openapi.vcs.actions.ShowNextChangeMarkerAction;
-import com.intellij.openapi.vcs.actions.ShowPrevChangeMarkerAction;
-import com.intellij.openapi.vfs.ReadonlyStatusHandler;
 import com.intellij.openapi.vfs.VirtualFile;
-import com.intellij.ui.ColoredSideBorder;
-import com.intellij.ui.HintListener;
-import com.intellij.ui.LightweightHint;
-import com.intellij.util.ui.UIUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import javax.swing.*;
-import java.awt.*;
-import java.awt.datatransfer.StringSelection;
-import java.awt.event.MouseEvent;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Iterator;
 import java.util.List;
+import java.util.ListIterator;
 
 /**
+ * @author irengrig
  * author: lesya
  */
 public class LineStatusTracker {
   private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.vcs.ex.LineStatusTracker");
+  // true -> have contents
+  private boolean myBaseLoaded;
+
   private final Document myDocument;
   private final Document myUpToDateDocument;
-  @SuppressWarnings({"FieldAccessedSynchronizedAndUnsynchronized"}) private List<Range> myRanges = new ArrayList<Range>();
+
+  private List<Range> myRanges;
+
   private final Project myProject;
-  @SuppressWarnings({"FieldAccessedSynchronizedAndUnsynchronized"}) private int myHighlighterCount = 0;
 
   private MyDocumentListener myDocumentListener;
 
-  private boolean myIsReleased = false;
-  private boolean myIsInitialized = false;
   private boolean myBulkUpdate;
+  private final Application myApplication;
 
-  public LineStatusTracker(Document document, Document upToDateDocument, Project project) {
+  private LineStatusTracker(final Document document, final Document upToDateDocument, final Project project) {
+    myApplication = ApplicationManager.getApplication();
     myDocument = document;
     myUpToDateDocument = upToDateDocument;
     myUpToDateDocument.putUserData(UndoManager.DONT_RECORD_UNDO, Boolean.TRUE);
     myProject = project;
+    myBaseLoaded = false;
+    myRanges = new ArrayList<Range>();
   }
 
-  public synchronized void initialize(@NotNull final String upToDateContent) {
-    if (myIsReleased) return;
-    LOG.assertTrue(!myIsInitialized);
-    try {
-      ApplicationManager.getApplication().runWriteAction(new Runnable() {
-        public void run() {
+  public void initialize(@NotNull final String upToDateContent) {
+    ApplicationManager.getApplication().isReadAccessAllowed();
+    LOG.assertTrue(!myBaseLoaded);
+
+    ApplicationManager.getApplication().runWriteAction(new Runnable() {
+      public void run() {
+        try {
+          myUpToDateDocument.setReadOnly(false);
           myUpToDateDocument.replaceString(0, myUpToDateDocument.getTextLength(), StringUtil.convertLineSeparators(upToDateContent));
+          myUpToDateDocument.setReadOnly(true);
+          reinstallRanges();
+
+          if (myDocumentListener == null) {
+            myDocumentListener = new MyDocumentListener();
+            myDocument.addDocumentListener(myDocumentListener);
+          }
         }
-      });
-
-      myUpToDateDocument.setReadOnly(true);
-      reinstallRanges();
-
-      myDocumentListener = new MyDocumentListener();
-      myDocument.addDocumentListener(myDocumentListener);
-    }
-    finally {
-      myIsInitialized = true;
-    }
+        finally {
+          myBaseLoaded = true;
+        }
+      }
+    });
   }
 
-  private synchronized void reinstallRanges() {
-    reinstallRanges(new RangesBuilder(myDocument, myUpToDateDocument).getRanges());
-  }
+  private void reinstallRanges() {
+    myApplication.assertWriteAccessAllowed();
 
-  private void reinstallRanges(List<Range> ranges) {
-    removeHighlighters();
-    myRanges = ranges;
-    addHighlighters();
-  }
-
-  private void addHighlighters() {
-    for (Range range : myRanges) {
-      if (!range.hasHighlighter()) range.setHighlighter(createHighlighter(range));
+    removeHighlightersFromMarkupModel();
+    myRanges = new RangesBuilder(myDocument, myUpToDateDocument).getRanges();
+    for (final Range range : myRanges) {
+      range.setHighlighter(createHighlighter(range));
     }
   }
 
   @SuppressWarnings({"AutoBoxing"})
-  synchronized private RangeHighlighter createHighlighter(Range range) {
+  private RangeHighlighter createHighlighter(final Range range) {
     int first =
       range.getOffset1() >= myDocument.getLineCount() ? myDocument.getTextLength() : myDocument.getLineStartOffset(range.getOffset1());
 
     int second =
       range.getOffset2() >= myDocument.getLineCount() ? myDocument.getTextLength() : myDocument.getLineStartOffset(range.getOffset2());
 
-
-    RangeHighlighter highlighter = myDocument.getMarkupModel(myProject)
+    final RangeHighlighter highlighter = myDocument.getMarkupModel(myProject)
       .addRangeHighlighter(first, second, HighlighterLayer.FIRST - 1, null, HighlighterTargetArea.LINES_IN_RANGE);
-    myHighlighterCount++;
-    TextAttributes attr = getAttributesFor(range);
+    final TextAttributes attr = LineStatusTrackerDrawing.getAttributesFor(range);
     highlighter.setErrorStripeMarkColor(attr.getErrorStripeColor());
     highlighter.setThinErrorStripeMark(true);
     highlighter.setGreedyToLeft(true);
     highlighter.setGreedyToRight(true);
-    highlighter.setLineMarkerRenderer(createRenderer(range));
+    highlighter.setLineMarkerRenderer(LineStatusTrackerDrawing.createRenderer(range, this));
     highlighter.setEditorFilter(MarkupEditorFilterFactory.createIsNotDiffFilter());
     final int line1 = myDocument.getLineNumber(first);
     final int line2 = myDocument.getLineNumber(second);
@@ -159,141 +135,17 @@ public class LineStatusTracker {
     return highlighter;
   }
 
-
-  private void removeHighlighters() {
-    for (Range oldRange : myRanges) {
-      removeHighlighter(oldRange.getHighlighter());
-      oldRange.setHighlighter(null);
-    }
-  }
-
-  synchronized void removeHighlighter(RangeHighlighter highlighter) {
-    if (highlighter == null) return;
-    MarkupModel markupModel = myDocument.getMarkupModel(myProject);
-    //noinspection ConstantConditions
-    if (markupModel == null) return;
-    markupModel.removeHighlighter(highlighter);
-    myHighlighterCount--;
-  }
-
-  private static TextAttributesKey getDiffColor(Range range) {
-    switch (range.getType()) {
-      case Range.INSERTED:
-        return DiffColors.DIFF_INSERTED;
-      case Range.DELETED:
-        return DiffColors.DIFF_DELETED;
-      case Range.MODIFIED:
-        return DiffColors.DIFF_MODIFIED;
-      default:
-        assert false;
-        return null;
-    }
-  }
-
-  private static TextAttributesKey getEditorColorNameFor(Range range) {
-    switch (range.getType()) {
-      case Range.MODIFIED:
-        return DiffColors.DIFF_MODIFIED;
-      case Range.DELETED:
-        return DiffColors.DIFF_DELETED;
-      default:
-        return DiffColors.DIFF_INSERTED;
-    }
-  }
-
-  private static TextAttributes getAttributesFor(Range range) {
-    final EditorColorsScheme globalScheme = EditorColorsManager.getInstance().getGlobalScheme();
-    final Color stripeColor = globalScheme.getAttributes(getEditorColorNameFor(range)).getErrorStripeColor();
-    final TextAttributes textAttributes = new TextAttributes(null, stripeColor, null, EffectType.BOXED, Font.PLAIN);
-    textAttributes.setErrorStripeColor(stripeColor);
-    return textAttributes;
-  }
-
-  private static void paintGutterFragment(Editor editor, Graphics g, Rectangle r, TextAttributesKey diffAttributeKey) {
-    final EditorGutterComponentEx gutter = ((EditorEx)editor).getGutterComponentEx();
-    final Color stripeColor = editor.getColorsScheme().getAttributes(diffAttributeKey).getErrorStripeColor();
-    g.setColor(brighter(stripeColor));
-
-    int endX = gutter.getWhitespaceSeparatorOffset();
-    int x = r.x + r.width - 2;
-    int width = endX - x;
-    if (r.height > 0) {
-      g.fillRect(x, r.y + 2, width, r.height - 4);
-      g.setColor(gutter.getOutlineColor(false));
-      UIUtil.drawLine(g, x, r.y + 2, x + width, r.y + 2);
-      UIUtil.drawLine(g, x, r.y + 2, x, r.y + r.height - 3);
-      UIUtil.drawLine(g, x, r.y + r.height - 3, x + width, r.y + r.height - 3);
-    }
-    else {
-      int[] xPoints = new int[]{x,
-        x,
-        x + width - 1};
-      int[] yPoints = new int[]{r.y - 4,
-        r.y + 4,
-        r.y};
-      g.fillPolygon(xPoints, yPoints, 3);
-
-      g.setColor(gutter.getOutlineColor(false));
-      g.drawPolygon(xPoints, yPoints, 3);
-    }
-  }
-
-  @Nullable
-  private static Color brighter(final Color color) {
-    if (color == null) {
-      return null;
-    }
-
-    final float[] hsbStripeColor = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);
-
-    if (hsbStripeColor[1] < 0.02f) {
-      // color is grey
-      hsbStripeColor[2] = Math.min(1.0f, hsbStripeColor[2] * 1.3f);
-    } else {
-      // let's decrease color saturation
-      hsbStripeColor[1] *= 0.3;
-
-      // max brightness
-      hsbStripeColor[2] = 1.0f;
-    }
-    return Color.getHSBColor(hsbStripeColor[0], hsbStripeColor[1], hsbStripeColor[2]);
-  }
-
-  private LineMarkerRenderer createRenderer(final Range range) {
-    return new ActiveGutterRenderer() {
-      public void paint(Editor editor, Graphics g, Rectangle r) {
-        paintGutterFragment(editor, g, r, getDiffColor(range));
+  public void release() {
+    myApplication.runWriteAction(new Runnable() {
+      @Override
+      public void run() {
+        if (myDocumentListener != null) {
+          myDocument.removeDocumentListener(myDocumentListener);
+        }
+        removeHighlightersFromMarkupModel();
+        myRanges.clear();
       }
-
-      public void doAction(Editor editor, MouseEvent e) {
-        e.consume();
-        JComponent comp = (JComponent)e.getComponent(); // shall be EditorGutterComponent, cast is safe.
-        JLayeredPane layeredPane = comp.getRootPane().getLayeredPane();
-        Point point = SwingUtilities.convertPoint(comp, ((EditorEx)editor).getGutterComponentEx().getWidth(), e.getY(), layeredPane);
-        showActiveHint(range, editor, point);
-      }
-
-      public boolean canDoAction(final MouseEvent e) {
-        final EditorGutterComponentEx gutter = (EditorGutterComponentEx)e.getComponent();
-        return  e.getX() > gutter.getLineMarkerAreaOffset() + gutter.getIconsAreaWidth();
-      }
-    };
-  }
-
-  public synchronized void release() {
-    try {
-      if (!myIsInitialized) return;
-      LOG.assertTrue(!myIsReleased);
-
-      removeHighlighters();
-      if (myDocumentListener != null) {
-        myDocument.removeDocumentListener(myDocumentListener);
-        myDocumentListener = null;
-      }
-    }
-    finally {
-      myIsReleased = true;
-    }
+    });
   }
 
   public Document getDocument() {
@@ -305,6 +157,8 @@ public class LineStatusTracker {
   }
 
   public List<Range> getRanges() {
+    myApplication.assertReadAccessAllowed();
+
     return myRanges;
   }
 
@@ -313,19 +167,56 @@ public class LineStatusTracker {
   }
 
   public void startBulkUpdate() {
-    myBulkUpdate = true;
-    for (Range oldRange : myRanges) {
-      removeHighlighter(oldRange.getHighlighter());
-      oldRange.setHighlighter(null);
+    myApplication.runWriteAction(new Runnable() {
+      @Override
+      public void run() {
+        myBulkUpdate = true;
+        removeHighlightersFromMarkupModel();
+        myRanges.clear();
+      }
+    });
+  }
+
+  private void removeHighlightersFromMarkupModel() {
+    final MarkupModel markupModel = myDocument.getMarkupModel(myProject);
+    for (Range range : myRanges) {
+      markupModel.removeHighlighter(range.getHighlighter());
     }
-    myRanges.clear();
   }
 
   public void finishBulkUpdate() {
-    if (myBulkUpdate) {
-      myBulkUpdate = false;
-      reinstallRanges();
-    }
+    myApplication.runWriteAction(new Runnable() {
+      @Override
+      public void run() {
+        myBulkUpdate = false;
+        reinstallRanges();
+      }
+    });
+  }
+
+  /**
+   * @return true if was cleared and base revision contents load should be started
+   * false -> load was already started; after contents is loaded,
+   */
+  public boolean resetForBaseRevisionLoad() {
+    return myApplication.runReadAction(new Computable<Boolean>() {
+      @Override
+      public Boolean compute() {
+        if (!myBaseLoaded) return false;
+        return myApplication.runWriteAction(new Computable<Boolean>() {
+          @Override
+          public Boolean compute() {
+            myUpToDateDocument.setReadOnly(false);
+            myUpToDateDocument.setText("");
+            myUpToDateDocument.setReadOnly(true);
+            removeHighlightersFromMarkupModel();
+            myRanges.clear();
+            myBaseLoaded = false;
+            return true;
+          }
+        });
+      }
+    });
   }
 
   private class MyDocumentListener extends DocumentAdapter {
@@ -336,7 +227,9 @@ public class LineStatusTracker {
     private int myLinesBeforeChange;
 
     public void beforeDocumentChange(DocumentEvent e) {
-      if (myBulkUpdate) return;
+      if (myBulkUpdate || (! myBaseLoaded)) return;
+      myApplication.assertWriteAccessAllowed();
+
       myFirstChangedLine = myDocument.getLineNumber(e.getOffset());
       myLastChangedLine = myDocument.getLineNumber(e.getOffset() + e.getOldLength());
       if (StringUtil.endsWithChar(e.getOldFragment(), '\n')) myLastChangedLine++;
@@ -382,14 +275,15 @@ public class LineStatusTracker {
     }
 
     public void documentChanged(DocumentEvent e) {
-      if (myBulkUpdate) return;
+      if (myBulkUpdate || (! myBaseLoaded)) return;
+      myApplication.assertWriteAccessAllowed();
 
       int line = myDocument.getLineNumber(e.getOffset() + e.getNewLength());
       int linesAfterChange = line - myDocument.getLineNumber(e.getOffset());
       int linesShift = linesAfterChange - myLinesBeforeChange;
 
-      List<Range> rangesAfterChange = getRangesAfter(myLastChangedLine);
-      List<Range> rangesBeforeChange = getRangesBefore(myFirstChangedLine);
+      List<Range> rangesAfterChange = getRangesAfter(myRanges, myLastChangedLine);
+      List<Range> rangesBeforeChange = getRangesBefore(myRanges, myFirstChangedLine);
 
       List<Range> changedRanges = getChangedRanges(myFirstChangedLine, myLastChangedLine);
 
@@ -416,19 +310,10 @@ public class LineStatusTracker {
         myRanges.addAll(newChangedRanges);
         myRanges.addAll(rangesAfterChange);
 
-        if (myHighlighterCount != myRanges.size()) {
-          LOG.error("Highlighters: " + myHighlighterCount + ", ranges: " + myRanges.size());
-        }
-
         myRanges = mergeRanges(myRanges);
 
         for (Range range : myRanges) {
           if (!range.hasHighlighter()) range.setHighlighter(createHighlighter(range));
-
-        }
-
-        if (myHighlighterCount != myRanges.size()) {
-          LOG.error("Highlighters: " + myHighlighterCount + ", ranges: " + myRanges.size());
         }
       }
 
@@ -442,6 +327,8 @@ public class LineStatusTracker {
     }
 
     private List<Range> mergeRanges(List<Range> ranges) {
+      final MarkupModel markupModel = myDocument.getMarkupModel(myProject);
+
       ArrayList<Range> result = new ArrayList<Range>();
       Iterator<Range> iterator = ranges.iterator();
       if (!iterator.hasNext()) return result;
@@ -449,6 +336,8 @@ public class LineStatusTracker {
       while (iterator.hasNext()) {
         Range range = iterator.next();
         if (prev.canBeMergedWith(range)) {
+          markupModel.removeHighlighter(range.getHighlighter());
+          markupModel.removeHighlighter(prev.getHighlighter());
           prev = prev.mergeWith(range, LineStatusTracker.this);
         }
         else {
@@ -461,8 +350,10 @@ public class LineStatusTracker {
     }
 
     private void replaceRanges(List<Range> rangesInChange, List<Range> newRangesInChange) {
+      final MarkupModel markupModel = myDocument.getMarkupModel(myProject);
+
       for (Range range : rangesInChange) {
-        removeHighlighter(range.getHighlighter());
+        markupModel.removeHighlighter(range.getHighlighter());
         range.setHighlighter(null);
       }
       for (Range range : newRangesInChange) {
@@ -491,9 +382,51 @@ public class LineStatusTracker {
     return result;
   }
 
-  private List<Range> getRangesBefore(int line) {
-    return getRangesBefore(myRanges, line);
+  @Nullable
+  Range getNextRange(final Range range) {
+    final int index = myRanges.indexOf(range);
+    if (index == myRanges.size() - 1) return null;
+    return myRanges.get(index + 1);
+  }
 
+  @Nullable
+  Range getPrevRange(final Range range) {
+    final int index = myRanges.indexOf(range);
+    if (index <= 0) return null;
+    return myRanges.get(index - 1);
+  }
+
+  @Nullable
+  public Range getNextRange(final int line) {
+    final Range currentRange = getRangeForLine(line);
+    if (currentRange != null) {
+      return getNextRange(currentRange);
+    }
+
+    for (final Range range : myRanges) {
+      if (line > range.getOffset1() || line > range.getOffset2()) {
+        continue;
+      }
+      return range;
+    }
+    return null;
+  }
+
+  @Nullable
+  public Range getPrevRange(final int line) {
+    final Range currentRange = getRangeForLine(line);
+    if (currentRange != null) {
+      return getPrevRange(currentRange);
+    }
+
+    for (ListIterator<Range> iterator = myRanges.listIterator(myRanges.size()); iterator.hasPrevious();) {
+      final Range range = iterator.previous();
+      if (range.getOffset1() > line) {
+        continue;
+      }
+      return range;
+    }
+    return null;
   }
 
   public static List<Range> getRangesBefore(List<Range> ranges, int line) {
@@ -506,10 +439,6 @@ public class LineStatusTracker {
     return result;
   }
 
-  private List<Range> getRangesAfter(int line) {
-    return getRangesAfter(myRanges, line);
-  }
-
   public static List<Range> getRangesAfter(List<Range> ranges, int line) {
     ArrayList<Range> result = new ArrayList<Range>();
     for (Range range : ranges) {
@@ -518,69 +447,6 @@ public class LineStatusTracker {
     return result;
   }
 
-  public void moveToRange(final Range range, final Editor editor) {
-    final int firstOffset = myDocument.getLineStartOffset(Math.min(range.getOffset1(), myDocument.getLineCount() - 1));
-    editor.getCaretModel().moveToOffset(firstOffset);
-    editor.getScrollingModel().scrollToCaret(ScrollType.CENTER);
-
-    editor.getScrollingModel().runActionOnScrollingFinished(new Runnable() {
-      public void run() {
-        Point p = editor.visualPositionToXY(editor.offsetToVisualPosition(firstOffset));
-        JComponent editorComponent = editor.getContentComponent();
-        JLayeredPane layeredPane = editorComponent.getRootPane().getLayeredPane();
-        p = SwingUtilities.convertPoint(editorComponent, 0, p.y, layeredPane);
-        showActiveHint(range, editor, p);
-      }
-    });
-  }
-
-  @Nullable
-  private Range getNextRange(Range range) {
-    int index = myRanges.indexOf(range);
-    if (index == myRanges.size() - 1) return null;
-    return myRanges.get(index + 1);
-  }
-
-  @Nullable
-  private Range getPrevRange(Range range) {
-    int index = myRanges.indexOf(range);
-    if (index <= 0) return null;
-    return myRanges.get(index - 1);
-  }
-
-  @Nullable
-  public Range getNextRange(int line) {
-    final Range currentRange = getRangeForLine(line);
-    if (currentRange != null) {
-      return getNextRange(currentRange);
-    }
-
-    for (Range range : myRanges) {
-      if (line > range.getOffset1() || line > range.getOffset2()) {
-        continue;
-      }
-      return range;
-    }
-    return null;
-  }
-
-  @Nullable
-  public Range getPrevRange(int line) {
-    final Range currentRange = getRangeForLine(line);
-    if (currentRange != null) {
-      return getPrevRange(currentRange);
-    }
-
-    for (ListIterator<Range> iterator = myRanges.listIterator(myRanges.size()); iterator.hasPrevious();) {
-      Range range = iterator.previous();
-      if (range.getOffset1() > line) {
-        continue;
-      }
-      return range;
-    }
-    return null;
-  }
-
   @Nullable
   public Range getRangeForLine(final int line) {
     for (final Range range : myRanges) {
@@ -594,63 +460,9 @@ public class LineStatusTracker {
     return null;
   }
 
-  public static abstract class MyAction extends AnAction implements DumbAware {
-    protected final LineStatusTracker myLineStatusTracker;
-    protected final Range myRange;
+  public void rollbackChanges(final Range range) {
+    myApplication.assertWriteAccessAllowed();
 
-    protected MyAction(String text, Icon icon, LineStatusTracker lineStatusTracker, Range range) {
-      super(text, null, icon);
-      myLineStatusTracker = lineStatusTracker;
-      myRange = range;
-    }
-
-    public void update(AnActionEvent e) {
-      e.getPresentation().setEnabled(isEnabled());
-    }
-
-    public abstract boolean isEnabled();
-
-    protected int getMyRangeIndex() {
-      List<Range> ranges = myLineStatusTracker.getRanges();
-      for (int i = 0; i < ranges.size(); i++) {
-        Range range = ranges.get(i);
-        if (range.getOffset1() == myRange.getOffset1() && range.getOffset2() == myRange.getOffset2()) {
-          return i;
-        }
-      }
-      return -1;
-    }
-  }
-
-  public static class RollbackAction extends LineStatusTracker.MyAction {
-    public RollbackAction(LineStatusTracker lineStatusTracker, Range range, Editor editor) {
-      super(VcsBundle.message("action.name.rollback"), IconLoader.getIcon("/actions/reset.png"), lineStatusTracker, range);
-    }
-
-    public boolean isEnabled() {
-      return true;
-    }
-
-    public void actionPerformed(AnActionEvent e) {
-      CommandProcessor.getInstance().executeCommand(myLineStatusTracker.getProject(), new Runnable() {
-        public void run() {
-          ApplicationManager.getApplication().runWriteAction(new Runnable() {
-            public void run() {
-              if (!myLineStatusTracker.getDocument().isWritable()) {
-                final ReadonlyStatusHandler.OperationStatus operationStatus = ReadonlyStatusHandler
-                  .getInstance(myLineStatusTracker.getProject()).ensureFilesWritable(myLineStatusTracker.getVirtualFile());
-                if (operationStatus.hasReadonlyFiles()) return;
-              }
-              myLineStatusTracker.rollbackChanges(myRange);
-            }
-          });
-        }
-      }, VcsBundle.message("command.name.rollback.change"), null);
-
-    }
-  }
-
-  public void rollbackChanges(Range range) {
     TextRange currentTextRange = getCurrentTextRange(range);
 
     if (range.getType() == Range.INSERTED) {
@@ -676,81 +488,25 @@ public class LineStatusTracker {
     return myUpToDateDocument.getCharsSequence().subSequence(startOffset, endOffset).toString();
   }
 
-  private Project getProject() {
+  Project getProject() {
     return myProject;
   }
 
-  public class ShowDiffAction extends LineStatusTracker.MyAction {
-    public ShowDiffAction(LineStatusTracker lineStatusTracker, Range range, Editor editor) {
-      super(VcsBundle.message("action.name.show.difference"), IconLoader.getIcon("/actions/diff.png"), lineStatusTracker, range);
-    }
-
-    public boolean isEnabled() {
-      return isModifiedRange() || isDeletedRange();
-    }
-
-    private boolean isDeletedRange() {
-      return myRange.getType() == Range.DELETED;
-    }
-
-    private boolean isModifiedRange() {
-      return myRange.getType() == Range.MODIFIED;
-    }
-
-    public void actionPerformed(AnActionEvent e) {
-      DiffManager.getInstance().getDiffTool().show(createDiffData());
-    }
-
-    private DiffRequest createDiffData() {
-      return new DiffRequest(myLineStatusTracker.getProject()) {
-        public DiffContent[] getContents() {
-          return new DiffContent[]{createDiffContent(myLineStatusTracker.getUpToDateDocument(),
-                                                     myLineStatusTracker.getUpToDateRange(myRange), null),
-            createDiffContent(myLineStatusTracker.getDocument(), myLineStatusTracker.getCurrentTextRange(myRange),
-                              myLineStatusTracker.getVirtualFile())};
-        }
-
-        public String[] getContentTitles() {
-          return new String[]{VcsBundle.message("diff.content.title.up.to.date"),
-            VcsBundle.message("diff.content.title.current.range")};
-        }
-
-        public String getWindowTitle() {
-          return VcsBundle.message("dialog.title.diff.for.range");
-        }
-      };
-    }
-
-    private DiffContent createDiffContent(final Document uDocument, TextRange textRange, VirtualFile file) {
-      DiffContent diffContent = new DocumentContent(myProject, uDocument);
-      return new FragmentContent(diffContent, textRange, myLineStatusTracker.getProject(), file);
-    }
+  TextRange getCurrentTextRange(Range range) {
+    return getRange(range.getType(), range.getOffset1(), range.getOffset2(), Range.DELETED, myDocument, false);
   }
 
-  public class CopyAction extends MyAction {
-    protected CopyAction(LineStatusTracker lineStatusTracker, Range range) {
-      super(VcsBundle.message("action.name.copy.old.text"), IconLoader.getIcon("/actions/copy.png"), lineStatusTracker, range);
-    }
-
-    public boolean isEnabled() {
-      return myRange.getType() == Range.DELETED || myRange.getType() == Range.MODIFIED;
-    }
-
-    public void actionPerformed(final AnActionEvent e) {
-      final String content = myLineStatusTracker.getUpToDateContent(myRange);
-      CopyPasteManager.getInstance().setContents(new StringSelection(content));
-    }
+  TextRange getUpToDateRange(Range range) {
+    return getRange(range.getType(), range.getUOffset1(), range.getUOffset2(), Range.INSERTED, myUpToDateDocument, false);
   }
 
-  private TextRange getCurrentTextRange(Range range) {
-    return getRange(range.getType(), range.getOffset1(), range.getOffset2(), Range.DELETED, myDocument);
+  // a hack
+  TextRange getUpToDateRangeWithEndSymbol(Range range) {
+    return getRange(range.getType(), range.getUOffset1(), range.getUOffset2(), Range.INSERTED, myUpToDateDocument, true);
   }
 
-  private TextRange getUpToDateRange(Range range) {
-    return getRange(range.getType(), range.getUOffset1(), range.getUOffset2(), Range.INSERTED, myUpToDateDocument);
-  }
-
-  private static TextRange getRange(byte rangeType, int offset1, int offset2, byte emptyRangeCondition, Document document) {
+  private static TextRange getRange(byte rangeType, int offset1, int offset2, byte emptyRangeCondition, Document document,
+                                    final boolean keepEnd) {
     if (rangeType == emptyRangeCondition) {
       int lineStartOffset;
       if (offset1 == 0) {
@@ -767,104 +523,28 @@ public class LineStatusTracker {
       int startOffset = document.getLineStartOffset(offset1);
       int endOffset = document.getLineEndOffset(offset2 - 1);
       if (startOffset > 0) {
-        startOffset--;
-        endOffset--;
+        -- startOffset;
+        if (! keepEnd) {
+          -- endOffset;
+        }
       }
       return new TextRange(startOffset, endOffset);
     }
   }
 
-
-  public void showActiveHint(Range range, final Editor editor, Point point) {
-
-    DefaultActionGroup group = new DefaultActionGroup();
-
-    final AnAction globalShowNextAction = ActionManager.getInstance().getAction("VcsShowNextChangeMarker");
-    final AnAction globalShowPrevAction = ActionManager.getInstance().getAction("VcsShowPrevChangeMarker");
-
-    final ShowPrevChangeMarkerAction localShowPrevAction = new ShowPrevChangeMarkerAction(getPrevRange(range), this, editor);
-    final ShowNextChangeMarkerAction localShowNextAction = new ShowNextChangeMarkerAction(getNextRange(range), this, editor);
-
-    JComponent editorComponent = editor.getComponent();
-
-    localShowNextAction.registerCustomShortcutSet(localShowNextAction.getShortcutSet(), editorComponent);
-    localShowPrevAction.registerCustomShortcutSet(localShowPrevAction.getShortcutSet(), editorComponent);
-
-    group.add(localShowPrevAction);
-    group.add(localShowNextAction);
-
-    localShowNextAction.copyFrom(globalShowNextAction);
-    localShowPrevAction.copyFrom(globalShowPrevAction);
-
-    group.add(new RollbackAction(this, range, editor));
-    group.add(new ShowDiffAction(this, range, editor));
-    group.add(new CopyAction(this, range));
-
-    final List<AnAction> actionList = (List<AnAction>)editorComponent.getClientProperty(AnAction.ourClientProperty);
-
-    actionList.remove(globalShowPrevAction);
-    actionList.remove(globalShowNextAction);
-
-    JComponent toolbar = ActionManager.getInstance().createActionToolbar(ActionPlaces.FILEHISTORY_VIEW_TOOLBAR, group, true).getComponent();
-
-    final Color background = ((EditorEx)editor).getBackgroundColor();
-    final Color foreground = editor.getColorsScheme().getColor(EditorColors.CARET_COLOR);
-    toolbar.setBackground(background);
-
-    toolbar.setBorder(new ColoredSideBorder(foreground, foreground, range.getType() != Range.INSERTED ? null : foreground, foreground, 1));
-
-    JPanel component = new JPanel(new BorderLayout());
-    component.setOpaque(false);
-
-    JPanel toolbarPanel = new JPanel(new BorderLayout());
-    toolbarPanel.setOpaque(false);
-    toolbarPanel.add(toolbar, BorderLayout.WEST);
-    component.add(toolbarPanel, BorderLayout.NORTH);
-
-    if (range.getType() != Range.INSERTED) {
-      DocumentEx doc = (DocumentEx)myUpToDateDocument;
-      EditorEx uEditor = (EditorEx)EditorFactory.getInstance().createViewer(doc, myProject);
-      EditorHighlighter highlighter = EditorHighlighterFactory.getInstance().createEditorHighlighter(myProject, getFileName());
-      uEditor.setHighlighter(highlighter);
-
-      EditorFragmentComponent editorFragmentComponent =
-        EditorFragmentComponent.createEditorFragmentComponent(uEditor, range.getUOffset1(), range.getUOffset2(), false, false);
-
-      component.add(editorFragmentComponent, BorderLayout.CENTER);
-      EditorFactory.getInstance().releaseEditor(uEditor);
-    }
-
-    LightweightHint lightweightHint = new LightweightHint(component);
-    lightweightHint.addHintListener(new HintListener() {
-      public void hintHidden(EventObject event) {
-        actionList.remove(localShowPrevAction);
-        actionList.remove(localShowNextAction);
-        actionList.add(globalShowPrevAction);
-        actionList.add(globalShowNextAction);
-      }
-    });
-
-    HintManagerImpl.getInstanceImpl().showEditorHint(lightweightHint, editor, point, HintManagerImpl.HIDE_BY_ANY_KEY | HintManagerImpl.HIDE_BY_TEXT_CHANGE |
-                                                                             HintManagerImpl.HIDE_BY_OTHER_HINT | HintManagerImpl.HIDE_BY_SCROLLING,
-                                                                             -1, false);
-  }
-
-  private String getFileName() {
-    VirtualFile file = FileDocumentManager.getInstance().getFile(myDocument);
-    if (file == null) return "";
-    return file.getName();
-  }
-
-  public static LineStatusTracker createOn(Document doc, String upToDateContent, Project project) {
-    Document document = EditorFactory.getInstance().createDocument(StringUtil.convertLineSeparators(upToDateContent));
+  public static LineStatusTracker createOn(final Document doc, final String upToDateContent, final Project project) {
+    final Document document = EditorFactory.getInstance().createDocument(StringUtil.convertLineSeparators(upToDateContent));
     final LineStatusTracker tracker = new LineStatusTracker(doc, document, project);
     tracker.initialize(upToDateContent);
     return tracker;
   }
 
-  public static LineStatusTracker createOn(Document doc, Project project) {
-    Document document = EditorFactory.getInstance().createDocument("");
+  public static LineStatusTracker createOn(final Document doc, final Project project) {
+    final Document document = EditorFactory.getInstance().createDocument("");
     return new LineStatusTracker(doc, document, project);
   }
 
+  public boolean isBaseLoaded() {
+    return myBaseLoaded;
+  }
 }
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTrackerDrawing.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTrackerDrawing.java
new file mode 100644
index 000000000000..53d50e986dc3
--- /dev/null
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/LineStatusTrackerDrawing.java
@@ -0,0 +1,250 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.vcs.ex;
+
+import com.intellij.codeInsight.hint.EditorFragmentComponent;
+import com.intellij.codeInsight.hint.HintManagerImpl;
+import com.intellij.openapi.actionSystem.ActionManager;
+import com.intellij.openapi.actionSystem.ActionPlaces;
+import com.intellij.openapi.actionSystem.AnAction;
+import com.intellij.openapi.actionSystem.DefaultActionGroup;
+import com.intellij.openapi.diff.DiffColors;
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.editor.EditorFactory;
+import com.intellij.openapi.editor.ScrollType;
+import com.intellij.openapi.editor.colors.EditorColors;
+import com.intellij.openapi.editor.colors.EditorColorsManager;
+import com.intellij.openapi.editor.colors.EditorColorsScheme;
+import com.intellij.openapi.editor.colors.TextAttributesKey;
+import com.intellij.openapi.editor.ex.DocumentEx;
+import com.intellij.openapi.editor.ex.EditorEx;
+import com.intellij.openapi.editor.ex.EditorGutterComponentEx;
+import com.intellij.openapi.editor.highlighter.EditorHighlighter;
+import com.intellij.openapi.editor.highlighter.EditorHighlighterFactory;
+import com.intellij.openapi.editor.markup.ActiveGutterRenderer;
+import com.intellij.openapi.editor.markup.EffectType;
+import com.intellij.openapi.editor.markup.LineMarkerRenderer;
+import com.intellij.openapi.editor.markup.TextAttributes;
+import com.intellij.openapi.fileEditor.FileDocumentManager;
+import com.intellij.openapi.vcs.actions.ShowNextChangeMarkerAction;
+import com.intellij.openapi.vcs.actions.ShowPrevChangeMarkerAction;
+import com.intellij.openapi.vfs.VirtualFile;
+import com.intellij.ui.ColoredSideBorder;
+import com.intellij.ui.HintListener;
+import com.intellij.ui.LightweightHint;
+import com.intellij.util.ui.UIUtil;
+import org.jetbrains.annotations.Nullable;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.MouseEvent;
+import java.util.EventObject;
+
+/**
+ * @author irengrig
+ */
+public class LineStatusTrackerDrawing {
+  private LineStatusTrackerDrawing() {
+  }
+
+  static TextAttributes getAttributesFor(final Range range) {
+    final EditorColorsScheme globalScheme = EditorColorsManager.getInstance().getGlobalScheme();
+    final Color stripeColor = globalScheme.getAttributes(getDiffColor(range)).getErrorStripeColor();
+    final TextAttributes textAttributes = new TextAttributes(null, stripeColor, null, EffectType.BOXED, Font.PLAIN);
+    textAttributes.setErrorStripeColor(stripeColor);
+    return textAttributes;
+  }
+
+  private static void paintGutterFragment(final Editor editor, final Graphics g, final Rectangle r, final TextAttributesKey diffAttributeKey) {
+    final EditorGutterComponentEx gutter = ((EditorEx)editor).getGutterComponentEx();
+    final Color stripeColor = editor.getColorsScheme().getAttributes(diffAttributeKey).getErrorStripeColor();
+    g.setColor(brighter(stripeColor));
+
+    final int endX = gutter.getWhitespaceSeparatorOffset();
+    final int x = r.x + r.width - 2;
+    final int width = endX - x;
+    if (r.height > 0) {
+      g.fillRect(x, r.y + 2, width, r.height - 4);
+      g.setColor(gutter.getOutlineColor(false));
+      UIUtil.drawLine(g, x, r.y + 2, x + width, r.y + 2);
+      UIUtil.drawLine(g, x, r.y + 2, x, r.y + r.height - 3);
+      UIUtil.drawLine(g, x, r.y + r.height - 3, x + width, r.y + r.height - 3);
+    }
+    else {
+      final int[] xPoints = new int[]{x,
+        x,
+        x + width - 1};
+      final int[] yPoints = new int[]{r.y - 4,
+        r.y + 4,
+        r.y};
+      g.fillPolygon(xPoints, yPoints, 3);
+
+      g.setColor(gutter.getOutlineColor(false));
+      g.drawPolygon(xPoints, yPoints, 3);
+    }
+  }
+
+  @Nullable
+  private static Color brighter(final Color color) {
+    if (color == null) {
+      return null;
+    }
+
+    final float[] hsbStripeColor = Color.RGBtoHSB(color.getRed(), color.getGreen(), color.getBlue(), null);
+
+    if (hsbStripeColor[1] < 0.02f) {
+      // color is grey
+      hsbStripeColor[2] = Math.min(1.0f, hsbStripeColor[2] * 1.3f);
+    } else {
+      // let's decrease color saturation
+      hsbStripeColor[1] *= 0.3;
+
+      // max brightness
+      hsbStripeColor[2] = 1.0f;
+    }
+    return Color.getHSBColor(hsbStripeColor[0], hsbStripeColor[1], hsbStripeColor[2]);
+  }
+
+  public static LineMarkerRenderer createRenderer(final Range range, final LineStatusTracker tracker) {
+    return new ActiveGutterRenderer() {
+      public void paint(final Editor editor, final Graphics g, final Rectangle r) {
+        paintGutterFragment(editor, g, r, getDiffColor(range));
+      }
+
+      public void doAction(final Editor editor, final MouseEvent e) {
+        e.consume();
+        final JComponent comp = (JComponent)e.getComponent(); // shall be EditorGutterComponent, cast is safe.
+        final JLayeredPane layeredPane = comp.getRootPane().getLayeredPane();
+        final Point point = SwingUtilities.convertPoint(comp, ((EditorEx)editor).getGutterComponentEx().getWidth(), e.getY(), layeredPane);
+        showActiveHint(range, editor, point, tracker);
+      }
+
+      public boolean canDoAction(final MouseEvent e) {
+        final EditorGutterComponentEx gutter = (EditorGutterComponentEx)e.getComponent();
+        return  e.getX() > gutter.getLineMarkerAreaOffset() + gutter.getIconsAreaWidth();
+      }
+    };
+  }
+
+  public static void showActiveHint(final Range range, final Editor editor, final Point point, final LineStatusTracker tracker) {
+
+    final DefaultActionGroup group = new DefaultActionGroup();
+
+    final AnAction globalShowNextAction = ActionManager.getInstance().getAction("VcsShowNextChangeMarker");
+    final AnAction globalShowPrevAction = ActionManager.getInstance().getAction("VcsShowPrevChangeMarker");
+
+    final ShowPrevChangeMarkerAction localShowPrevAction = new ShowPrevChangeMarkerAction(tracker.getPrevRange(range), tracker, editor);
+    final ShowNextChangeMarkerAction localShowNextAction = new ShowNextChangeMarkerAction(tracker.getNextRange(range), tracker, editor);
+
+    final JComponent editorComponent = editor.getComponent();
+
+    localShowNextAction.registerCustomShortcutSet(localShowNextAction.getShortcutSet(), editorComponent);
+    localShowPrevAction.registerCustomShortcutSet(localShowPrevAction.getShortcutSet(), editorComponent);
+
+    group.add(localShowPrevAction);
+    group.add(localShowNextAction);
+
+    localShowNextAction.copyFrom(globalShowNextAction);
+    localShowPrevAction.copyFrom(globalShowPrevAction);
+
+    group.add(new RollbackLineStatusRangeAction(tracker, range, editor));
+    group.add(new ShowLineStatusRangeDiffAction(tracker, range, editor));
+    group.add(new CopyLineStatusRangeAction(tracker, range));
+
+    final java.util.List<AnAction> actionList = (java.util.List<AnAction>)editorComponent.getClientProperty(AnAction.ourClientProperty);
+
+    actionList.remove(globalShowPrevAction);
+    actionList.remove(globalShowNextAction);
+
+    final JComponent toolbar = ActionManager.getInstance().createActionToolbar(ActionPlaces.FILEHISTORY_VIEW_TOOLBAR, group, true).getComponent();
+
+    final Color background = ((EditorEx)editor).getBackgroundColor();
+    final Color foreground = editor.getColorsScheme().getColor(EditorColors.CARET_COLOR);
+    toolbar.setBackground(background);
+
+    toolbar.setBorder(new ColoredSideBorder(foreground, foreground, (range.getType() != Range.INSERTED) ? null : foreground, foreground, 1));
+
+    final JPanel component = new JPanel(new BorderLayout());
+    component.setOpaque(false);
+
+    final JPanel toolbarPanel = new JPanel(new BorderLayout());
+    toolbarPanel.setOpaque(false);
+    toolbarPanel.add(toolbar, BorderLayout.WEST);
+    component.add(toolbarPanel, BorderLayout.NORTH);
+
+    if (range.getType() != Range.INSERTED) {
+      final DocumentEx doc = (DocumentEx) tracker.getUpToDateDocument();
+      final EditorEx uEditor = (EditorEx)EditorFactory.getInstance().createViewer(doc, tracker.getProject());
+      final EditorHighlighter highlighter = EditorHighlighterFactory.getInstance().createEditorHighlighter(tracker.getProject(), getFileName(tracker.getDocument()));
+      uEditor.setHighlighter(highlighter);
+
+      final EditorFragmentComponent editorFragmentComponent =
+        EditorFragmentComponent.createEditorFragmentComponent(uEditor, range.getUOffset1(), range.getUOffset2(), false, false);
+
+      component.add(editorFragmentComponent, BorderLayout.CENTER);
+      EditorFactory.getInstance().releaseEditor(uEditor);
+    }
+
+    final LightweightHint lightweightHint = new LightweightHint(component);
+    lightweightHint.addHintListener(new HintListener() {
+      public void hintHidden(final EventObject event) {
+        actionList.remove(localShowPrevAction);
+        actionList.remove(localShowNextAction);
+        actionList.add(globalShowPrevAction);
+        actionList.add(globalShowNextAction);
+      }
+    });
+
+    HintManagerImpl.getInstanceImpl().showEditorHint(lightweightHint, editor, point, HintManagerImpl.HIDE_BY_ANY_KEY | HintManagerImpl.HIDE_BY_TEXT_CHANGE |
+                                                                             HintManagerImpl.HIDE_BY_OTHER_HINT | HintManagerImpl.HIDE_BY_SCROLLING,
+                                                                             -1, false);
+  }
+
+  private static String getFileName(final Document document) {
+    final VirtualFile file = FileDocumentManager.getInstance().getFile(document);
+    if (file == null) return "";
+    return file.getName();
+  }
+
+  public static void moveToRange(final Range range, final Editor editor, final LineStatusTracker tracker) {
+    final Document document = tracker.getDocument();
+    final int firstOffset = document.getLineStartOffset(Math.min(range.getOffset1(), document.getLineCount() - 1));
+    editor.getCaretModel().moveToOffset(firstOffset);
+    editor.getScrollingModel().scrollToCaret(ScrollType.CENTER);
+
+    editor.getScrollingModel().runActionOnScrollingFinished(new Runnable() {
+      public void run() {
+        Point p = editor.visualPositionToXY(editor.offsetToVisualPosition(firstOffset));
+        final JComponent editorComponent = editor.getContentComponent();
+        final JLayeredPane layeredPane = editorComponent.getRootPane().getLayeredPane();
+        p = SwingUtilities.convertPoint(editorComponent, 0, p.y, layeredPane);
+        showActiveHint(range, editor, p, tracker);
+      }
+    });
+  }
+
+  private static TextAttributesKey getDiffColor(Range range) {
+    switch (range.getType()) {
+      case Range.INSERTED:
+        return DiffColors.DIFF_INSERTED;
+      case Range.DELETED:
+        return DiffColors.DIFF_DELETED;
+      case Range.MODIFIED:
+        return DiffColors.DIFF_MODIFIED;
+      default:
+        assert false;
+        return null;
+    }
+  }
+}
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/Range.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/Range.java
index eba9acb089a3..219e330f679b 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/Range.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/Range.java
@@ -154,12 +154,7 @@ public class Range {
   }
 
   public Range mergeWith(Range range, LineStatusTracker tracker) {
-    tracker.removeHighlighter(getHighlighter());
-    setHighlighter(null);
-    tracker.removeHighlighter(range.getHighlighter());
-    range.setHighlighter(null);
-    Range result = new Range(myOffset1, range.myOffset2, myUpToDateOffset1, range.myUpToDateOffset2, mergedStatusWith(range));
-    return result;
+    return new Range(myOffset1, range.myOffset2, myUpToDateOffset1, range.myUpToDateOffset2, mergedStatusWith(range));
   }
 
   private byte mergedStatusWith(Range range) {
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RangesBuilder.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RangesBuilder.java
index f64ea80bf5fd..594b125f9aa6 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RangesBuilder.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RangesBuilder.java
@@ -16,11 +16,10 @@
 package com.intellij.openapi.vcs.ex;
 
 import com.intellij.openapi.editor.Document;
-import com.intellij.openapi.editor.EditorFactory;
 import com.intellij.util.ArrayUtil;
 import com.intellij.util.diff.Diff;
 
-import java.util.ArrayList;
+import java.util.LinkedList;
 import java.util.List;
 
 /**
@@ -30,16 +29,12 @@ import java.util.List;
 public class RangesBuilder {
   private List<Range> myRanges;
 
-  public RangesBuilder(String current, String upToDate) {
-    this(EditorFactory.getInstance().createDocument(current), EditorFactory.getInstance().createDocument(upToDate));
-  }
-
   public RangesBuilder(Document current, Document upToDate) {
     this(new DocumentWrapper(current).getLines(), new DocumentWrapper(upToDate).getLines(), 0, 0);
   }
 
   public RangesBuilder(List<String> current, List<String> upToDate, int shift, int uShift) {
-    myRanges = new ArrayList<Range>();
+    myRanges = new LinkedList<Range>();
 
     int shiftBefore = 0;
 
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RollbackLineStatusRangeAction.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RollbackLineStatusRangeAction.java
new file mode 100644
index 000000000000..07c6190c707d
--- /dev/null
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/RollbackLineStatusRangeAction.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.vcs.ex;
+
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.command.CommandProcessor;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.util.IconLoader;
+import com.intellij.openapi.vcs.VcsBundle;
+import com.intellij.openapi.vfs.ReadonlyStatusHandler;
+
+/**
+* @author irengrig
+*/
+public class RollbackLineStatusRangeAction extends BaseLineStatusRangeAction {
+  public RollbackLineStatusRangeAction(final LineStatusTracker lineStatusTracker, final Range range, final Editor editor) {
+    super(VcsBundle.message("action.name.rollback"), IconLoader.getIcon("/actions/reset.png"), lineStatusTracker, range);
+  }
+
+  public boolean isEnabled() {
+    return true;
+  }
+
+  public void actionPerformed(final AnActionEvent e) {
+    CommandProcessor.getInstance().executeCommand(myLineStatusTracker.getProject(), new Runnable() {
+      public void run() {
+        ApplicationManager.getApplication().runWriteAction(new Runnable() {
+          public void run() {
+            if (!myLineStatusTracker.getDocument().isWritable()) {
+              final ReadonlyStatusHandler.OperationStatus operationStatus = ReadonlyStatusHandler
+                .getInstance(myLineStatusTracker.getProject()).ensureFilesWritable(myLineStatusTracker.getVirtualFile());
+              if (operationStatus.hasReadonlyFiles()) return;
+            }
+            myLineStatusTracker.rollbackChanges(myRange);
+          }
+        });
+      }
+    }, VcsBundle.message("command.name.rollback.change"), null);
+
+  }
+}
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/ShowLineStatusRangeDiffAction.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/ShowLineStatusRangeDiffAction.java
new file mode 100644
index 000000000000..8f9fee4eab25
--- /dev/null
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/ex/ShowLineStatusRangeDiffAction.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.vcs.ex;
+
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.diff.*;
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.editor.Editor;
+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.IconLoader;
+import com.intellij.openapi.util.TextRange;
+import com.intellij.openapi.vcs.VcsBundle;
+import com.intellij.openapi.vfs.VirtualFile;
+
+/**
+* @author irengrig
+*/
+public class ShowLineStatusRangeDiffAction extends BaseLineStatusRangeAction {
+  public ShowLineStatusRangeDiffAction(final LineStatusTracker lineStatusTracker, final Range range, final Editor editor) {
+    super(VcsBundle.message("action.name.show.difference"), IconLoader.getIcon("/actions/diff.png"), lineStatusTracker, range);
+  }
+
+  public boolean isEnabled() {
+    return isModifiedRange() || isDeletedRange();
+  }
+
+  private boolean isDeletedRange() {
+    return Range.DELETED == myRange.getType();
+  }
+
+  private boolean isModifiedRange() {
+    return Range.MODIFIED == myRange.getType();
+  }
+
+  public void actionPerformed(final AnActionEvent e) {
+    DiffManager.getInstance().getDiffTool().show(createDiffData());
+  }
+
+  private DiffRequest createDiffData() {
+    return new DiffRequest(myLineStatusTracker.getProject()) {
+      public DiffContent[] getContents() {
+        return new DiffContent[]{createDiffContent(myLineStatusTracker.getUpToDateDocument(),
+                                                   myLineStatusTracker.getUpToDateRangeWithEndSymbol(myRange), null),
+          createDiffContent(myLineStatusTracker.getDocument(), myLineStatusTracker.getCurrentTextRange(myRange),
+                            myLineStatusTracker.getVirtualFile())};
+      }
+
+      public String[] getContentTitles() {
+        return new String[]{VcsBundle.message("diff.content.title.up.to.date"),
+          VcsBundle.message("diff.content.title.current.range")};
+      }
+
+      public String getWindowTitle() {
+        return VcsBundle.message("dialog.title.diff.for.range");
+      }
+    };
+  }
+
+  private DiffContent createDiffContent(final Document uDocument, final TextRange textRange, final VirtualFile file) {
+    final Project project = myLineStatusTracker.getProject();
+    final DiffContent diffContent = new DocumentContent(project, uDocument);
+    return new FragmentContent(diffContent, textRange, project, file);
+  }
+}
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManager.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManager.java
index 5bd61146daad..d2842e40cfd7 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManager.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManager.java
@@ -24,7 +24,9 @@ package com.intellij.openapi.vcs.impl;
 
 import com.intellij.lifecycle.PeriodicalTasksCloser;
 import com.intellij.openapi.Disposable;
+import com.intellij.openapi.application.Application;
 import com.intellij.openapi.application.ApplicationManager;
+import com.intellij.openapi.application.ModalityState;
 import com.intellij.openapi.components.ProjectComponent;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.editor.Document;
@@ -40,11 +42,14 @@ import com.intellij.openapi.editor.ex.DocumentBulkUpdateListener;
 import com.intellij.openapi.fileEditor.FileDocumentManager;
 import com.intellij.openapi.fileEditor.FileEditorManager;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.util.Computable;
+import com.intellij.openapi.util.Condition;
 import com.intellij.openapi.util.Disposer;
 import com.intellij.openapi.vcs.AbstractVcs;
 import com.intellij.openapi.vcs.FileStatus;
 import com.intellij.openapi.vcs.FileStatusListener;
 import com.intellij.openapi.vcs.FileStatusManager;
+import com.intellij.openapi.vcs.changes.committed.AbstractCalledLater;
 import com.intellij.openapi.vcs.ex.LineStatusTracker;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.openapi.vfs.VirtualFileAdapter;
@@ -56,50 +61,79 @@ import com.intellij.util.containers.HashMap;
 import org.jetbrains.annotations.NonNls;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.Arrays;
 import java.util.Collection;
+import java.util.Collections;
+import java.util.Map;
 
-public class LineStatusTrackerManager implements ProjectComponent {
+public class LineStatusTrackerManager implements ProjectComponent, LineStatusTrackerManagerI {
   private static final Logger LOG = Logger.getInstance("#com.intellij.openapi.vcs.impl.LineStatusTrackerManager");
 
-  public static LineStatusTrackerManager getInstance(Project project) {
-    return PeriodicalTasksCloser.getInstance().safeGetComponent(project, LineStatusTrackerManager.class);
+  public static LineStatusTrackerManagerI getInstance(final Project project) {
+    if (System.getProperty(IGNORE_CHANGEMARKERS_KEY) != null) {
+      return Dummy.getInstance();
+    }
+    return PeriodicalTasksCloser.getInstance().safeGetComponent(project, LineStatusTrackerManagerI.class);
   }
 
   private final Project myProject;
 
-  private HashMap<Document, LineStatusTracker> myLineStatusTrackers =
-    new HashMap<Document, LineStatusTracker>();
+  private final Map<Document, LineStatusTracker> myLineStatusTrackers;
+  // !!! no state queries and self lock for add/remove
+  // removal from here - not under write action
+  private final Map<Document, Alarm> myLineStatusUpdateAlarms;
 
-  private final HashMap<Document, Alarm> myLineStatusUpdateAlarms =
-    new HashMap<Document, Alarm>();
-
-  private final Object TRACKERS_LOCK = new Object();
-  private boolean myIsDisposed = false;
   @NonNls protected static final String IGNORE_CHANGEMARKERS_KEY = "idea.ignore.changemarkers";
+
   private final ProjectLevelVcsManagerImpl myVcsManager;
   private final VcsFileStatusProvider myStatusProvider;
+  private final Application myApplication;
+  private final FileEditorManager myFileEditorManager;
+  private final Disposable myDisposable;
 
-  public LineStatusTrackerManager(final Project project, final ProjectLevelVcsManagerImpl vcsManager, final VcsFileStatusProvider statusProvider) {
+  public LineStatusTrackerManager(final Project project, final ProjectLevelVcsManagerImpl vcsManager, final VcsFileStatusProvider statusProvider,
+                                  final Application application, final FileEditorManager fileEditorManager) {
     myProject = project;
     myVcsManager = vcsManager;
     myStatusProvider = statusProvider;
+    myApplication = application;
+    myFileEditorManager = fileEditorManager;
+    myLineStatusTrackers = new HashMap<Document, LineStatusTracker>();
+    myLineStatusUpdateAlarms = Collections.synchronizedMap(new HashMap<Document, Alarm>());
 
     project.getMessageBus().connect().subscribe(DocumentBulkUpdateListener.TOPIC, new DocumentBulkUpdateListener.Adapter() {
       public void updateStarted(final Document doc) {
+        myApplication.assertWriteAccessAllowed(); // can remove after some testing
+
         final LineStatusTracker tracker = getLineStatusTracker(doc);
         if (tracker != null) tracker.startBulkUpdate();
       }
 
       public void updateFinished(final Document doc) {
+        myApplication.assertWriteAccessAllowed(); // can remove after some testing
+
         final LineStatusTracker tracker = getLineStatusTracker(doc);
         if (tracker != null) tracker.finishBulkUpdate();
       }
     });
+
+    myDisposable = new Disposable() {
+      @Override
+      public void dispose() {
+        final Collection<LineStatusTracker> trackers = myLineStatusTrackers.values();
+        final LineStatusTracker[] lineStatusTrackers = trackers.toArray(new LineStatusTracker[trackers.size()]);
+        for (final LineStatusTracker tracker : lineStatusTrackers) {
+          releaseTracker(tracker.getDocument());
+        }
+
+        myLineStatusTrackers.clear();
+        assert myLineStatusUpdateAlarms.isEmpty();
+        myLineStatusUpdateAlarms.clear();
+      }
+    };
+    Disposer.register(myProject, myDisposable);
   }
 
   public void projectOpened() {
-    trackAwtThread();
     final MyFileStatusListener fileStatusListener = new MyFileStatusListener();
     final EditorFactoryListener editorFactoryListener = new MyEditorFactoryListener();
     final MyVirtualFileListener virtualFileListener = new MyVirtualFileListener();
@@ -109,7 +143,6 @@ public class LineStatusTrackerManager implements ProjectComponent {
       }
     };
 
-    myLineStatusTrackers = new HashMap<Document, LineStatusTracker>();
     final FileStatusManager fsManager = FileStatusManager.getInstance(myProject);
     fsManager.addFileStatusListener(fileStatusListener, myProject);
 
@@ -122,9 +155,8 @@ public class LineStatusTrackerManager implements ProjectComponent {
     final EditorColorsManager editorColorsManager = EditorColorsManager.getInstance();
     editorColorsManager.addEditorColorsListener(editorColorsListener);
 
-    Disposer.register(myProject, new Disposable() {
+    Disposer.register(myDisposable, new Disposable() {
       public void dispose() {
-        trackAwtThread();
         fsManager.removeFileStatusListener(fileStatusListener);
         virtualFileManager.removeVirtualFileListener(virtualFileListener);
         editorColorsManager.removeEditorColorsListener(editorColorsListener);
@@ -133,13 +165,6 @@ public class LineStatusTrackerManager implements ProjectComponent {
   }
 
   public void projectClosed() {
-    try {
-      trackAwtThread();
-      dispose();
-    }
-    finally {
-      myIsDisposed = true;
-    }
   }
 
   @NonNls @NotNull
@@ -153,213 +178,212 @@ public class LineStatusTrackerManager implements ProjectComponent {
   public void disposeComponent() {
   }
 
-  private void dispose() {
-    final Collection<LineStatusTracker> trackers = myLineStatusTrackers.values();
-    final LineStatusTracker[] lineStatusTrackers = trackers.toArray(new LineStatusTracker[trackers.size()]);
-    for (LineStatusTracker tracker : lineStatusTrackers) {
-      releaseTracker(tracker.getDocument());
-    }
+  @Override
+  public LineStatusTracker getLineStatusTracker(final Document document) {
+    myApplication.assertReadAccessAllowed();
 
-    myLineStatusTrackers = null;
-}
-
-  public LineStatusTracker getLineStatusTracker(Document document) {
-    trackAwtThread();
-    if (myLineStatusTrackers == null) return null;
+    if ((! myProject.isOpen()) || myProject.isDisposed()) return null;
     return myLineStatusTrackers.get(document);
   }
 
-
-  public LineStatusTracker setUpToDateContent(final Document document, final String lastUpToDateContent) {
-    trackAwtThread();
-    LineStatusTracker result = myLineStatusTrackers.get(document);
-    if (result == null) {
-      result = LineStatusTracker.createOn(document, lastUpToDateContent, myProject);
-      myLineStatusTrackers.put(document, result);
-    }
-    return result;
-  }
-
-  private LineStatusTracker createTrackerForDocument(Document document, VirtualFile vf) {
-    LOG.assertTrue(!myLineStatusTrackers.containsKey(document));
-    LineStatusTracker result = LineStatusTracker.createOn(document, myProject);
-    myLineStatusTrackers.put(document, result);
-    return result;
-  }
-
-  private void resetTracker(final VirtualFile virtualFile) {
-    if (System.getProperty(IGNORE_CHANGEMARKERS_KEY) != null) return;
+  private void resetTracker(@NotNull final VirtualFile virtualFile) {
+    if ((! myProject.isOpen()) || myProject.isDisposed()) return;
 
     final Document document = FileDocumentManager.getInstance().getCachedDocument(virtualFile);
     if (document == null) {
-      if (LOG.isDebugEnabled()) {
-        LOG.debug("Skipping resetTracker() because no cached document for " + virtualFile.getPath());
-      }
+      log("Skipping resetTracker() because no cached document for " + virtualFile.getPath());
       return;
     }
 
-    if (LOG.isDebugEnabled()) {
-      LOG.debug("resetting tracker for file " + virtualFile.getPath());
-    }
-    synchronized (TRACKERS_LOCK) {
-      final LineStatusTracker tracker = myLineStatusTrackers.get(document);
-      if (tracker != null) {
-        resetTracker(tracker);
-      }
-      else {
-        if (Arrays.asList(FileEditorManager.getInstance(myProject).getOpenFiles()).contains(virtualFile)) {
+    log("resetting tracker for file " + virtualFile.getPath());
+
+    final LineStatusTracker tracker = myLineStatusTrackers.get(document);
+    final boolean editorOpened = myFileEditorManager.isFileOpen(virtualFile);
+    final boolean shouldBeInstalled = shouldBeInstalled(virtualFile) && editorOpened;
+
+    if (tracker == null && (! shouldBeInstalled)) return;
+
+    myApplication.runWriteAction(new Runnable() {
+      @Override
+      public void run() {
+        // remove ?
+        if (tracker != null) {
+          if (! shouldBeInstalled) {
+            releaseTracker(document);
+            return;
+          } else if ((! tracker.isBaseLoaded())) {
+            return; // will be recalculated
+          } else {
+            tracker.resetForBaseRevisionLoad();
+            startAlarm(document, virtualFile);
+          }
+        } else if (shouldBeInstalled) {
           installTracker(virtualFile, document);
         }
       }
-    }
+    });
   }
 
-  private boolean releaseTracker(Document document) {
-    synchronized (TRACKERS_LOCK) {
-      releaseUpdateAlarms(document);
-      if (myLineStatusTrackers == null) return false;
-      if (!myLineStatusTrackers.containsKey(document)) return false;
-      LineStatusTracker tracker = myLineStatusTrackers.remove(document);
-      tracker.release();
-      return true;
-    }
-  }
+  private void releaseTracker(final Document document) {
+    if ((! myProject.isOpen()) || myProject.isDisposed()) return;
 
-  private void releaseUpdateAlarms(final Document document) {
-    if (myLineStatusUpdateAlarms.containsKey(document)) {
-      final Alarm alarm = myLineStatusUpdateAlarms.get(document);
-      if (alarm != null) {
-        alarm.cancelAllRequests();
+    myApplication.runWriteAction(new Runnable() {
+      @Override
+      public void run() {
+        final Alarm alarm = myLineStatusUpdateAlarms.remove(document);
+        if (alarm != null) {
+          alarm.cancelAllRequests();
+        }
+        final LineStatusTracker tracker = myLineStatusTrackers.remove(document);
+        if (tracker != null) {
+          tracker.release();
+        }
       }
-      myLineStatusUpdateAlarms.remove(document);
-    }
+    });
   }
 
-  public void resetTracker(final LineStatusTracker tracker) {
-    trackAwtThread();
-    if (tracker != null) {
-      ApplicationManager.getApplication().invokeLater(new Runnable() {
+  private boolean shouldBeInstalled(final VirtualFile virtualFile) {
+    ApplicationManager.getApplication().assertIsDispatchThread();
+
+    if (virtualFile == null || virtualFile instanceof LightVirtualFile) return false;
+    if (! virtualFile.isInLocalFileSystem()) return false;
+    if ((! myProject.isOpen()) || myProject.isDisposed()) return false;
+    final FileStatusManager statusManager = FileStatusManager.getInstance(myProject);
+    if (statusManager == null) return false;
+    final AbstractVcs activeVcs = myVcsManager.getVcsFor(virtualFile);
+    if (activeVcs == null) {
+      log("installTracker() for file " + virtualFile.getPath() + " failed: no active VCS");
+      return false;
+    }
+    final FileStatus status = statusManager.getStatus(virtualFile);
+    if (status == FileStatus.NOT_CHANGED || status == FileStatus.ADDED || status == FileStatus.UNKNOWN || status == FileStatus.IGNORED) {
+      log("installTracker() for file " + virtualFile.getPath() + " failed: status=" + status);
+      return false;
+    }
+    return true;
+  }
+
+  private void installTracker(final VirtualFile virtualFile, final Document document) {
+    /*ApplicationManager.getApplication().assertIsDispatchThread();
+
+    if (virtualFile == null || virtualFile instanceof LightVirtualFile) return;
+    if (! virtualFile.isInLocalFileSystem()) return;
+    if ((! myProject.isOpen()) || myProject.isDisposed()) return;
+    final FileStatusManager statusManager = FileStatusManager.getInstance(myProject);
+    if (statusManager == null) return;
+    final AbstractVcs activeVcs = myVcsManager.getVcsFor(virtualFile);
+    if (activeVcs == null) {
+      if (LOG.isDebugEnabled()) {
+        LOG.info("installTracker() for file " + virtualFile.getPath() + " failed: no active VCS");
+      }
+      return;
+    }
+    final FileStatus status = statusManager.getStatus(virtualFile);
+    if (status == FileStatus.NOT_CHANGED || status == FileStatus.ADDED || status == FileStatus.UNKNOWN || status == FileStatus.IGNORED) {
+      if (LOG.isDebugEnabled()) {
+        LOG.info("installTracker() for file " + virtualFile.getPath() + " failed: status=" + status);
+        System.out.println("installTracker() for file " + virtualFile.getPath() + " failed: status=" + status);
+      }
+      return;
+    }   */
+
+    myApplication.runWriteAction(new Runnable() {
+      @Override
+      public void run() {
+        if (myLineStatusTrackers.containsKey(document)) return;
+        assert !myLineStatusUpdateAlarms.containsKey(document);
+
+        final LineStatusTracker tracker = LineStatusTracker.createOn(document, myProject);
+        myLineStatusTrackers.put(document, tracker);
+
+        startAlarm(document, virtualFile);
+      }
+    });
+  }
+
+  private void startAlarm(final Document document, final VirtualFile virtualFile) {
+    myApplication.assertWriteAccessAllowed();
+
+    final Alarm alarm = new Alarm(Alarm.ThreadToUse.SHARED_THREAD);
+    myLineStatusUpdateAlarms.put(document, alarm);
+    alarm.addRequest(new BaseRevisionLoader(alarm, document, virtualFile), 10);
+  }
+
+  private class BaseRevisionLoader implements Runnable {
+    private final Alarm myAlarm;
+    private final VirtualFile myVirtualFile;
+    private final Document myDocument;
+
+    private BaseRevisionLoader(final Alarm alarm, final Document document, final VirtualFile virtualFile) {
+      myAlarm = alarm;
+      myDocument = document;
+      myVirtualFile = virtualFile;
+    }
+
+    @Override
+    public void run() {
+      myAlarm.cancelAllRequests();
+      final Boolean removed = myApplication.runReadAction(new Computable<Boolean>() {
+        @Override
+        public Boolean compute() {
+          final Alarm removed = myLineStatusUpdateAlarms.remove(myDocument);
+          return removed != null;
+        }
+      });
+      if (! Boolean.TRUE.equals(removed)) return;
+      if ((! myProject.isOpen()) || myProject.isDisposed()) return;
+
+      if (! myVirtualFile.isValid()) {
+        log("installTracker() for file " + myVirtualFile.getPath() + " failed: virtual file not valid");
+        return;
+      }
+
+      final String lastUpToDateContent = myStatusProvider.getBaseVersionContent(myVirtualFile);
+      if (lastUpToDateContent == null) {
+        log("installTracker() for file " + myVirtualFile.getPath() + " failed: no up to date content");
+        return;
+      }
+
+      myApplication.invokeLater(new Runnable() {
         public void run() {
-          if (myIsDisposed) return;
-          if (releaseTracker(tracker.getDocument())) {
-            installTracker(tracker.getVirtualFile(), tracker.getDocument());
-          }
+          ApplicationManager.getApplication().runWriteAction(new Runnable() {
+            public void run() {
+              log("initializing tracker for file " + myVirtualFile.getPath());
+              final LineStatusTracker tracker = myLineStatusTrackers.get(myDocument);
+              if (tracker != null) {
+                tracker.initialize(lastUpToDateContent);
+              }
+            }
+          });
+        }
+      }, new Condition() {
+        @Override
+        public boolean value(final Object ignore) {
+          return (! myProject.isOpen()) || myProject.isDisposed();
         }
       });
     }
   }
 
-  private void installTracker(final VirtualFile virtualFile, final Document document) {
-    if (virtualFile == null || virtualFile instanceof LightVirtualFile) return;
-    ApplicationManager.getApplication().assertIsDispatchThread();
-
-    if (myProject.isDisposed() || myLineStatusTrackers == null) return;
-    final FileStatusManager statusManager = FileStatusManager.getInstance(myProject);
-    if (statusManager == null) return;
-    final FileStatus status = statusManager.getStatus(virtualFile);
-
-    synchronized (TRACKERS_LOCK) {
-      if (myLineStatusTrackers.containsKey(document)) return;
-
-      if (status == FileStatus.NOT_CHANGED ||
-          status == FileStatus.ADDED ||
-          status == FileStatus.UNKNOWN ||
-          status == FileStatus.IGNORED) {
-        if (LOG.isDebugEnabled()) {
-          LOG.debug("installTracker() for file " + virtualFile.getPath() + " failed: status=" + status);
-        }
-        return;
-      }
-
-      AbstractVcs activeVcs = myVcsManager.getVcsFor(virtualFile);
-
-      if (activeVcs == null) {
-        if (LOG.isDebugEnabled()) {
-          LOG.debug("installTracker() for file " + virtualFile.getPath() + " failed: no active VCS");
-        }
-        return;
-      }
-
-      if (!virtualFile.isInLocalFileSystem()) return;
-
-      if (System.getProperty(IGNORE_CHANGEMARKERS_KEY) != null) return;
-
-      final Alarm alarm;
-
-      if (myLineStatusUpdateAlarms.containsKey(document)) {
-        alarm = myLineStatusUpdateAlarms.get(document);
-        alarm.cancelAllRequests();
-      }
-      else {
-        alarm = new Alarm(Alarm.ThreadToUse.SHARED_THREAD);
-        myLineStatusUpdateAlarms.put(document, alarm);
-      }
-
-      final LineStatusTracker tracker = createTrackerForDocument(document, virtualFile);
-
-      alarm.addRequest(new Runnable() {
-        public void run() {
-          try {
-            alarm.cancelAllRequests();
-            if (!virtualFile.isValid()) {
-              if (LOG.isDebugEnabled()) {
-                LOG.debug("installTracker() for file " + virtualFile.getPath() + " failed: virtual file not valid");
-              }
-              return;
-            }
-            final String lastUpToDateContent = myStatusProvider.getBaseVersionContent(virtualFile);
-            if (lastUpToDateContent == null) {
-              if (LOG.isDebugEnabled()) {
-                LOG.debug("installTracker() for file " + virtualFile.getPath() + " failed: no up to date content");
-              }
-              return;
-            }
-            ApplicationManager.getApplication().invokeLater(new Runnable() {
-              public void run() {
-                if (!myProject.isDisposed()) {
-                  ApplicationManager.getApplication().runWriteAction(new Runnable() {
-                    public void run() {
-                      if (LOG.isDebugEnabled()) {
-                        LOG.debug("initializing tracker for file " + virtualFile.getPath());
-                      }
-                      synchronized (TRACKERS_LOCK) {
-                        tracker.initialize(lastUpToDateContent);
-                      }
-                    }
-                  });
-                }
-              }
-            });
-          }
-          finally {
-            // todo guard alarms!!!
-            myLineStatusUpdateAlarms.remove(document);
-          }
-        }
-      }, 10);
-    }
-
-  }
-
   private void resetTrackersForOpenFiles() {
-    final VirtualFile[] openFiles = FileEditorManager.getInstance(myProject).getOpenFiles();
-    synchronized (TRACKERS_LOCK) {
-      for(VirtualFile openFile: openFiles) {
-        resetTracker(openFile);
-      }
+    myApplication.assertReadAccessAllowed();
+    if ((! myProject.isOpen()) || myProject.isDisposed()) return;
+
+    final VirtualFile[] openFiles = myFileEditorManager.getOpenFiles();
+    for(final VirtualFile openFile: openFiles) {
+      // write action inside is sufficient level
+      resetTracker(openFile);
     }
   }
 
   private class MyFileStatusListener implements FileStatusListener {
     public void fileStatusesChanged() {
       if (myProject.isDisposed()) return;
-      LOG.debug("LineStatusTrackerManager: fileStatusesChanged");
-      trackAwtThread();
+      log("LineStatusTrackerManager: fileStatusesChanged");
       resetTrackersForOpenFiles();
     }
 
     public void fileStatusChanged(@NotNull VirtualFile virtualFile) {
-      trackAwtThread();
       resetTracker(virtualFile);
     }
   }
@@ -370,33 +394,46 @@ public class LineStatusTrackerManager implements ProjectComponent {
       // outside of EDT, so the EDT check mustn't be done here
       Editor editor = event.getEditor();
       if (editor.getProject() != null && editor.getProject() != myProject) return;
-      Document document = editor.getDocument();
-      VirtualFile virtualFile = FileDocumentManager.getInstance().getFile(document);
-      installTracker(virtualFile, document);
+      final Document document = editor.getDocument();
+      final VirtualFile virtualFile = FileDocumentManager.getInstance().getFile(document);
+
+      new AbstractCalledLater(myProject, ModalityState.NON_MODAL) {
+        @Override
+        public void run() {
+          if (shouldBeInstalled(virtualFile)) {
+            installTracker(virtualFile, document);
+          }
+        }
+      }.callMe();
     }
 
     public void editorReleased(EditorFactoryEvent event) {
-      trackAwtThread();
       final Editor editor = event.getEditor();
       if (editor.getProject() != null && editor.getProject() != myProject) return;
       final Document doc = editor.getDocument();
       final Editor[] editors = event.getFactory().getEditors(doc, myProject);
       if (editors.length == 0) {
-        releaseTracker(doc);
+        new AbstractCalledLater(myProject, ModalityState.NON_MODAL) {
+          @Override
+          public void run() {
+            releaseTracker(doc);
+          }
+        }.callMe();
       }
     }
   }
 
   private class MyVirtualFileListener extends VirtualFileAdapter {
     public void beforeContentsChange(VirtualFileEvent event) {
-      trackAwtThread();
       if (event.isFromRefresh()) {
         resetTracker(event.getFile());
       }
     }
   }
 
-  private static void trackAwtThread() {
-    ApplicationManager.getApplication().assertIsDispatchThread();
+  private static void log(final String s) {
+    if (LOG.isDebugEnabled()) {
+      LOG.debug(s);
+    }
   }
 }
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManagerI.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManagerI.java
new file mode 100644
index 000000000000..d6dcdc3ee1aa
--- /dev/null
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/LineStatusTrackerManagerI.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2000-2010 JetBrains s.r.o.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.intellij.openapi.vcs.impl;
+
+import com.intellij.openapi.editor.Document;
+import com.intellij.openapi.vcs.ex.LineStatusTracker;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * @author irengrig
+ */
+public interface LineStatusTrackerManagerI {
+  @Nullable
+  LineStatusTracker getLineStatusTracker(Document document);
+
+  class Dummy implements LineStatusTrackerManagerI {
+    private final static Dummy ourInstance = new Dummy();
+
+    public static Dummy getInstance() {
+      return ourInstance;
+    }
+
+    @Override
+    public LineStatusTracker getLineStatusTracker(final Document document) {
+      return null;
+    }
+  }
+}
diff --git a/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/UpToDateLineNumberProviderImpl.java b/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/UpToDateLineNumberProviderImpl.java
index 14d668f06285..857437149d69 100644
--- a/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/UpToDateLineNumberProviderImpl.java
+++ b/platform/vcs-impl/src/com/intellij/openapi/vcs/impl/UpToDateLineNumberProviderImpl.java
@@ -40,7 +40,7 @@ public class UpToDateLineNumberProviderImpl implements UpToDateLineNumberProvide
   public int getLineNumber(int currentNumber) {
     LineStatusTracker tracker = LineStatusTrackerManager.getInstance(myProject).getLineStatusTracker(myDocument);
     if (tracker == null) {
-      tracker = LineStatusTrackerManager.getInstance(myProject).setUpToDateContent(myDocument, myUpToDateContent);
+      return currentNumber;
     }
     return calcLineNumber(tracker, currentNumber);
   }