Expand FrameSeleciton::isContentEditable() to increase chances of hoisting update layout

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2012 Digia Plc. and/or its subsidiary(-ies)
  * Copyright (C) 2015 Google 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:
@@ skipping 969 matching lines @@
     const MouseEventWithHitTestResults& mev,
     const LayoutPoint& position) {
   if (!selection().isAvailable())
     return;
   if (selection().contains(position) || mev.scrollbar() ||
       // FIXME: In the editable case, word selection sometimes selects content
       // that isn't underneath the mouse.
       // If the selection is non-editable, we do word selection to make it
       // easier to use the contextual menu items available for text selections.
       // But only if we're above text.
-      !(selection().isContentEditable() ||
+      !(selection()
+            .computeVisibleSelectionInDOMTreeDeprecated()
+            .isContentEditable() ||
         (mev.innerNode() && mev.innerNode()->isTextNode())))
     return;
 
   // Context menu events are always allowed to perform a selection.
   AutoReset<bool> mouseDownMayStartSelectChange(&m_mouseDownMayStartSelect,
                                                 true);
 
   if (hitTestResultIsMisspelled(mev.hitTestResult()))
     return selectClosestMisspellingFromMouseEvent(mev);
 
@@ skipping 78 matching lines @@
 
 bool isExtendingSelection(const MouseEventWithHitTestResults& event) {
   bool isMouseDownOnLinkOrImage =
       event.isOverLink() || event.hitTestResult().image();
   return (event.event().modifiers() & WebInputEvent::Modifiers::ShiftKey) !=
              0 &&
          !isMouseDownOnLinkOrImage;
 }
 
 }  // namespace blink