Let Selection.collapse remember a raw Position instead of a canonicalized one.

Source/core/editing/InputMethodController.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 292 matching lines @@
             for (size_t i = 0; i < numUnderlines; ++i) {
                 m_customCompositionUnderlines[i].startOffset += baseOffset;
                 m_customCompositionUnderlines[i].endOffset += baseOffset;
             }
             if (baseNode->renderer())
                 baseNode->renderer()->repaint();
 
             unsigned start = std::min(baseOffset + selectionStart, extentOffset);
             unsigned end = std::min(std::max(start, baseOffset + selectionEnd), extentOffset);
             RefPtrWillBeRawPtr<Range> selectedRange = Range::create(baseNode->document(), baseNode, start, baseNode, end);
-            m_frame.selection().setSelectedRange(selectedRange.get(), DOWNSTREAM, static_cast<FrameSelection::SetSelectionOption>(0));
+            m_frame.selection().setSelectedRange(selectedRange.get(), DOWNSTREAM, false, NotUserTriggered);
         }
     }
 }
 
 void InputMethodController::setCompositionFromExistingText(const Vector<CompositionUnderline>& underlines, unsigned compositionStart, unsigned compositionEnd)
 {
     Node* editable = m_frame.selection().rootEditableElement();
     Position base = m_frame.selection().base().downstream();
     Node* baseNode = base.anchorNode();
     if (editable->firstChild() == baseNode && editable->lastChild() == baseNode && baseNode->isTextNode()) {
@@ skipping 52 matching lines @@
     if (selectionOffsets.isNull())
         return false;
     Element* rootEditableElement = m_frame.selection().rootEditableElement();
     if (!rootEditableElement)
         return false;
 
     RefPtrWillBeRawPtr<Range> range = selectionOffsets.createRange(*rootEditableElement);
     if (!range)
         return false;
 
-    return m_frame.selection().setSelectedRange(range.get(), VP_DEFAULT_AFFINITY, FrameSelection::CloseTyping);
+    return m_frame.selection().setSelectedRange(range.get(), VP_DEFAULT_AFFINITY, false, FrameSelection::CloseTyping);
 }
 
 bool InputMethodController::setEditableSelectionOffsets(const PlainTextRange& selectionOffsets)
 {
     if (!editor().canEdit())
         return false;
     return setSelectionOffsets(selectionOffsets);
 }
 
 void InputMethodController::extendSelectionAndDelete(int before, int after)
 {
     if (!editor().canEdit())
         return;
     PlainTextRange selectionOffsets(getSelectionOffsets());
     if (selectionOffsets.isNull())
         return;
     setSelectionOffsets(PlainTextRange(std::max(static_cast<int>(selectionOffsets.start()) - before, 0), selectionOffsets.end() + after));
     TypingCommand::deleteSelection(*m_frame.document());
 }
 
 } // namespace WebCore