Invalidate the previous caret even if the parent text node is removed.

third_party/WebKit/Source/core/editing/FrameSelection.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 170 matching lines @@
 
     bool isAppearanceDirty() const;
     void commitAppearanceIfNeeded(LayoutView&);
     void updateAppearance();
     void setCaretVisible(bool caretIsVisible) { setCaretVisibility(caretIsVisible ? Visible : Hidden); }
     bool isCaretBoundsDirty() const { return m_caretRectDirty; }
     void setCaretRectNeedsUpdate();
     void scheduleVisualUpdate() const;
     void invalidateCaretRect();
     void paintCaret(GraphicsContext&, const LayoutPoint&);
-    bool ShouldPaintCaretForTesting() const { return m_shouldPaintCaret; }
 
     // Used to suspend caret blinking while the mouse is down.
     void setCaretBlinkingSuspended(bool suspended) { m_isCaretBlinkingSuspended = suspended; }
     bool isCaretBlinkingSuspended() const { return m_isCaretBlinkingSuspended; }
 
     // Focus
     void setFocused(bool);
     bool isFocused() const { return m_focused; }
     bool isFocusedAndActive() const;
     void pageActivationChanged();
@@ skipping 78 matching lines @@
     void setCaretVisibility(CaretVisibility);
     bool shouldBlinkCaret() const;
 
     void updateSelectionIfNeeded(const Position& base, const Position& extent, const Position& start, const Position& end);
 
     template <typename Strategy>
     VisibleSelectionTemplate<Strategy> validateSelection(const VisibleSelectionTemplate<Strategy>&);
 
     GranularityStrategy* granularityStrategy();
 
+    // For unittests
+    bool shouldPaintCaretForTesting() const { return m_shouldPaintCaret; }
+    bool isPreviousCaretDirtyForTesting() const { return m_previousCaretNode; }
+
     RawPtrWillBeMember<LocalFrame> m_frame;
     const OwnPtrWillBeMember<PendingSelection> m_pendingSelection;
     const OwnPtrWillBeMember<SelectionEditor> m_selectionEditor;
 
     // Used to store base before the adjustment at bidi boundary
     VisiblePosition m_originalBase;
     VisiblePositionInFlatTree m_originalBaseInFlatTree;
     TextGranularity m_granularity;
 
     RefPtrWillBeMember<Node> m_previousCaretNode; // The last node which painted the caret. Retained for clearing the old caret when it moves.
@@ skipping 30 matching lines @@
 }
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::FrameSelection&);
 void showTree(const blink::FrameSelection*);
 #endif
 
 #endif // FrameSelection_h