[Editing][Stability] Recanonicalize m_originalbase in FrameSelection

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

 /*
  * Copyright (C) 2004, 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 207 matching lines @@
         visibleExtent = createVisiblePosition(fromPositionInDOMTree<Strategy>(extent.positionAtLeftBoundaryOfBiDiRun()));
         return;
     }
 
     if (extent.atRightBoundaryOfBidiRun() && extent.isEquivalent(base.rightBoundaryOfBidiRun(extent.bidiLevelOnLeft()))) {
         visibleExtent = createVisiblePosition(fromPositionInDOMTree<Strategy>(extent.positionAtRightBoundaryOfBiDiRun()));
         return;
     }
 }
 
+void FrameSelection::setOriginalBase(const VisiblePosition& newBase)
+{
+    m_originalBase = newBase;
+    m_originalBaseInFlatTree = createVisiblePosition(toPositionInFlatTree(newBase.deepEquivalent()));
+}
+
+void FrameSelection::setOriginalBase(const VisiblePositionInFlatTree& newBase)
+{
+    m_originalBaseInFlatTree = newBase;
+    m_originalBase = createVisiblePosition(toPositionInDOMTree(newBase.deepEquivalent()));
+}
+
 template <typename Strategy>
 void FrameSelection::setNonDirectionalSelectionIfNeededAlgorithm(const VisibleSelectionTemplate<Strategy>& passedNewSelection, TextGranularity granularity,
     EndPointsAdjustmentMode endpointsAdjustmentMode)
 {
     VisibleSelectionTemplate<Strategy> newSelection = passedNewSelection;
     bool isDirectional = shouldAlwaysUseDirectionalSelection(m_frame) || newSelection.isDirectional();
 
-    const VisiblePositionTemplate<Strategy> originalBase = this->originalBase<Strategy>();
+    const PositionTemplate<Strategy> basePosition = this->originalBase<Strategy>().deepEquivalent();
+    const VisiblePositionTemplate<Strategy> originalBase = basePosition.inShadowIncludingDocument() ? createVisiblePosition(basePosition) : VisiblePositionTemplate<Strategy>();
     const VisiblePositionTemplate<Strategy> base = originalBase.isNotNull() ? originalBase : createVisiblePosition(newSelection.base());
     VisiblePositionTemplate<Strategy> newBase = base;
     const VisiblePositionTemplate<Strategy> extent = createVisiblePosition(newSelection.extent());
     VisiblePositionTemplate<Strategy> newExtent = extent;
     if (endpointsAdjustmentMode == AdjustEndpointsAtBidiBoundary)
         adjustEndpointsAtBidiBoundary(newBase, newExtent);
 
     if (newBase.deepEquivalent() != base.deepEquivalent() || newExtent.deepEquivalent() != extent.deepEquivalent()) {
         setOriginalBase(base);
         newSelection.setBase(newBase);
@@ skipping 411 matching lines @@
 void FrameSelection::clear()
 {
     m_granularity = CharacterGranularity;
     if (m_granularityStrategy)
         m_granularityStrategy->Clear();
     setSelection(VisibleSelection());
 }
 
 void FrameSelection::prepareForDestruction()
 {
+    m_originalBase = VisiblePosition();
+    m_originalBaseInFlatTree = VisiblePositionInFlatTree();
     m_granularity = CharacterGranularity;
 
     m_caretBlinkTimer.stop();
 
     LayoutViewItem view = m_frame->contentLayoutItem();
     if (!view.isNull())
         view.clearSelection();
 
     setSelection(VisibleSelection(), CloseTyping | ClearTypingStyle | DoNotUpdateAppearance);
     m_selectionEditor->dispose();
@@ skipping 778 matching lines @@
 
 void showTree(const blink::FrameSelection* sel)
 {
     if (sel)
         sel->showTreeForThis();
     else
         fprintf(stderr, "Cannot showTree for (nil) FrameSelection.\n");
 }
 
 #endif