Invalidate first line display item clients when first line style changes

third_party/WebKit/Source/core/layout/LayoutText.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Andrew Wellington (proton@wiretapped.net)
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 1870 matching lines @@
     // for every inline box. This won't cause more rasterization invalidations because the whole LayoutText is being invalidated.
     for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box, invalidationReason, paintInvalidationRect);
         if (box->truncation() != cNoTruncation) {
             if (EllipsisBox* ellipsisBox = box->root().ellipsisBox())
                 paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*ellipsisBox, invalidationReason, paintInvalidationRect);
         }
     }
 }
 
+void LayoutText::invalidateDisplayItemClientsOfFirstLine()
+{
+    for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox()) {
+        if (!box->isFirstLineStyle())
+            break;
+        invalidateDisplayItemClient(*box);
+        if (box->truncation() != cNoTruncation) {
+            if (EllipsisBox* ellipsisBox = box->root().ellipsisBox())
+                invalidateDisplayItemClient(*ellipsisBox);
+        }
+    }
+}
+
 } // namespace blink