EA-26971 - assert: CaretModelImpl.moveToOffset

1. Debug info is added;
2. Green code policy is applied;

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

@@ -182,7 +182,10 @@ public class CaretModelImpl implements CaretModel, PrioritizedDocumentListener,
     validateCallContext();
     moveToLogicalPosition(myEditor.offsetToLogicalPosition(offset), locateBeforeSoftWrap);
     if (!myEditor.offsetToLogicalPosition(myOffset).equals(myEditor.offsetToLogicalPosition(offset))) {
-      LOG.error("caret moved to wrong offset. Requested:" + offset + " but actual:" + myOffset);
+      LOG.error(
+        "caret moved to wrong offset. Requested:" + offset + " but actual:" + myOffset 
+        + ". Soft wraps data: " + myEditor.getSoftWrapModel() + ", folding data: " + myEditor.getFoldingModel()
+        + ", document:\n" + myEditor.getDocument().getText());
     }
   }
 

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

@@ -38,6 +38,7 @@ import com.intellij.openapi.editor.ex.PrioritizedDocumentListener;
 import com.intellij.openapi.editor.markup.TextAttributes;
 import com.intellij.util.containers.MultiMap;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.awt.*;
 import java.util.Arrays;
@@ -219,6 +220,7 @@ public class FoldingModelImpl implements FoldingModelEx, PrioritizedDocumentList
     return myFoldTree.fetchAllRegions();
   }
 
+  @Nullable
   public FoldRegion getCollapsedRegionAtOffset(int offset) {
     return myFoldTree.fetchOutermost(offset);
   }
@@ -227,6 +229,7 @@ public class FoldingModelImpl implements FoldingModelEx, PrioritizedDocumentList
     return myFoldTree.getLastTopLevelIndexBefore(offset);
   }
 
+  @Nullable
   public FoldRegion getFoldingPlaceholderAt(Point p) {
     assertReadAccess();
     LogicalPosition pos = myEditor.xyToLogicalPosition(p);
@@ -410,10 +413,12 @@ public class FoldingModelImpl implements FoldingModelEx, PrioritizedDocumentList
     return myFoldTree.getFoldedLinesCountBefore(offset);
   }
 
+  @Nullable
   public FoldRegion[] fetchTopLevel() {
     return myFoldTree.fetchTopLevel();
   }
 
+  @Nullable
   public FoldRegion fetchOutermost(int offset) {
     return myFoldTree.fetchOutermost(offset);
   }
@@ -478,4 +483,9 @@ public class FoldingModelImpl implements FoldingModelEx, PrioritizedDocumentList
       listener.onFoldRegionStateChange(foldRegion);
     }
   }
+
+  @Override
+  public String toString() {
+    return Arrays.toString(myFoldTree.fetchTopLevel());
+  }
 }

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

@@ -654,6 +654,11 @@ public class SoftWrapModelImpl implements SoftWrapModelEx, PrioritizedDocumentLi
     }
   }
 
+  @Override
+  public String toString() {
+    return myDataMapper.toString();
+  }
+
   /**
    * Defines generic interface for the command that may be proceeded in both <code>'soft wraps aware'</code> and
    * <code>'soft wraps unaware'</code> modes.