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

third_party/WebKit/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 798 matching lines @@
   // a composition without starting it from the beginning.
   // http://crbug.com/37993
   do {
     if (!setSelectionOffsets(PlainTextRange(
             std::max(static_cast<int>(selectionOffsets.start()) - before, 0),
             selectionOffsets.end() + after)))
       return;
     if (before == 0)
       break;
     ++before;
-  } while (frame().selection().start() ==
+  } while (frame().selection()
+                   .computeVisibleSelectionInDOMTreeDeprecated()
+                   .start() ==
                frame()
                    .selection()
                    .computeVisibleSelectionInDOMTreeDeprecated()
                    .end() &&
            before <= static_cast<int>(selectionOffsets.start()));
   // TODO(chongz): Find a way to distinguish Forward and Backward.
   Node* target = document().focusedElement();
   if (target) {
     dispatchBeforeInputEditorCommand(
         target, InputEvent::InputType::DeleteContentBackward,
@@ skipping 289 matching lines @@
   finishComposingText(DoNotKeepSelection);
 }
 
 DEFINE_TRACE(InputMethodController) {
   visitor->trace(m_frame);
   visitor->trace(m_compositionRange);
   SynchronousMutationObserver::trace(visitor);
 }
 
 }  // namespace blink