Early return if SelectionInDOMTree is None at LayoutSelection::CalcSelectionPaintRange.

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 300 matching lines @@
       continue;
     layout_object->SetShouldInvalidateSelection();
   }
 
   // Reset selection.
   paint_range_ = SelectionPaintRange();
 }
 
 static SelectionPaintRange CalcSelectionPaintRange(
     const FrameSelection& frame_selection) {
+  const SelectionInDOMTree& selection_in_dom =
+      frame_selection.GetSelectionInDOMTree();
+  if (selection_in_dom.IsNone())
+    return SelectionPaintRange();
+
   const VisibleSelectionInFlatTree& original_selection =
       frame_selection.ComputeVisibleSelectionInFlatTree();
   // Construct a new VisibleSolution, since visibleSelection() is not
   // necessarily valid, and the following steps assume a valid selection. See
   // <https://bugs.webkit.org/show_bug.cgi?id=69563> and
   // <rdar://problem/10232866>.
   const SelectionInFlatTree& new_selection = CalcSelection(
       original_selection, frame_selection.ShouldShowBlockCursor());
   const VisibleSelectionInFlatTree& selection =
       CreateVisibleSelection(new_selection);
@@ skipping 122 matching lines @@
 
     o->SetShouldInvalidateSelection();
   }
 }
 
 DEFINE_TRACE(LayoutSelection) {
   visitor->Trace(frame_selection_);
 }
 
 }  // namespace blink