incapsulate rtl context determination in Caret instance

platform/editor-ui-api/src/com/intellij/openapi/editor/Caret.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 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.
@@ -296,4 +296,10 @@ public interface Caret extends UserDataHolderEx, Disposable {
    */
   @Nullable
   Caret clone(boolean above);
+
+  /**
+   * Returns <code>true</code> if caret is located in RTL text fragment. In that case visual column number is inversely related
+   * to offset and logical column number in the vicinity of caret.
+   */
+  boolean isAtRtlLocation();
 }

platform/lang-impl/src/com/intellij/injected/editor/InjectedCaret.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 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.
@@ -237,4 +237,9 @@ public class InjectedCaret implements Caret {
   public <T> void putUserData(@NotNull Key<T> key, @Nullable T value) {
     myDelegate.putUserData(key, value);
   }
+
+  @Override
+  public boolean isAtRtlLocation() {
+    return myDelegate.isAtRtlLocation();
+  }
 }

platform/platform-impl/src/com/intellij/openapi/editor/impl/CaretImpl.java

@@ -1461,6 +1461,11 @@ public class CaretImpl extends UserDataHolderBase implements Caret {
     return "Caret at " + myVisibleCaret + (mySelectionMarker == null ? "" : (", selection marker: " + mySelectionMarker.toString()));
   }
 
+  @Override
+  public boolean isAtRtlLocation() {
+    return myEditor.myUseNewRendering && myEditor.myView.isRtlLocation(myOffset, myLogicalCaret.leansForward);
+  }
+
   /**
    * Encapsulates information about target vertical range info - its <code>'y'</code> coordinate and height in pixels.
    */

platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorImpl.java

@@ -4598,7 +4598,7 @@ public final class EditorImpl extends UserDataHolderBase implements EditorEx, Hi
   private void setCursorPosition() {
     final List<CaretRectangle> caretPoints = new ArrayList<CaretRectangle>();
     for (Caret caret : getCaretModel().getAllCarets()) {
-      boolean isRtl = myUseNewRendering && myView.isRtlLocation(caret.getOffset(), caret.getLogicalPosition().leansForward);
+      boolean isRtl = caret.isAtRtlLocation();
       VisualPosition caretPosition = caret.getVisualPosition();
       Point pos1 = visualPositionToXY(caretPosition);
       Point pos2 = visualPositionToXY(new VisualPosition(caretPosition.line, Math.max(0, caretPosition.column + (isRtl ? -1 : 1))));

platform/platform-impl/src/com/intellij/openapi/editor/textarea/TextComponentCaret.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 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.
@@ -198,6 +198,11 @@ public class TextComponentCaret extends UserDataHolderBase implements Caret {
   public void dispose() {
   }
 
+  @Override
+  public boolean isAtRtlLocation() {
+    return false;
+  }
+
   private SelectionModel getSelectionModel() {
     return myEditor.getSelectionModel();
   }