Audit the use of updateStyleAndLayoutIgnorePendingStylesheets in PlainTextRange.

third_party/WebKit/Source/core/editing/commands/ApplyStyleCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2008, 2009 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 284 matching lines @@
             }
 
             if (nextParagraphStart.isOrphan())
                 nextParagraphStart = nextPositionOf(endOfParagraph(paragraphStart));
         }
 
         paragraphStart = nextParagraphStart;
         nextParagraphStart = nextPositionOf(endOfParagraph(paragraphStart));
     }
 
+    // Update style and layout again, since added or removed styles could have
+    // affected the layout. We need clean layout in order to compute
+    // plain-text ranges below.
+    document().updateStyleAndLayoutIgnorePendingStylesheets();
+
     EphemeralRange startEphemeralRange = PlainTextRange(startIndex).createRangeForSelection(toContainerNode(scope));
     if (startEphemeralRange.isNull())
         return;
     EphemeralRange endEphemeralRange = PlainTextRange(endIndex).createRangeForSelection(toContainerNode(scope));
     if (endEphemeralRange.isNull())
         return;
     updateStartEnd(startEphemeralRange.startPosition(), endEphemeralRange.startPosition());
 }
 
 static MutableStylePropertySet* copyStyleOrCreateEmpty(const StylePropertySet* style)
@@ skipping 1411 matching lines @@
 DEFINE_TRACE(ApplyStyleCommand)
 {
     visitor->trace(m_style);
     visitor->trace(m_start);
     visitor->trace(m_end);
     visitor->trace(m_styledInlineElement);
     CompositeEditCommand::trace(visitor);
 }
 
 } // namespace blink