Invalidate first line display item clients when first line style changes

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

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All right reserved.
  * Copyright (C) 2010 Google 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 2047 matching lines @@
     LayoutUnit totalLogicalWidth;
     LayoutUnit logicalLeft = logicalLeftOffsetForLine(logicalHeight(), false);
     LayoutUnit availableLogicalWidth = logicalRightOffsetForLine(logicalHeight(), false) - logicalLeft;
     updateLogicalWidthForAlignment(textAlign, 0, 0, logicalLeft, totalLogicalWidth, availableLogicalWidth, 0);
 
     if (!style()->isLeftToRightDirection())
         return logicalWidth() - logicalLeft;
     return logicalLeft;
 }
 
+static void invalidteDisplayItemClientsOfInlineBoxRecursively(InlineBox& box)
+{
+    box.layoutObject().invalidateDisplayItemClient(box);
+    if (!box.isInlineFlowBox())
+        return;
+    for (InlineBox* child = toInlineFlowBox(box).firstChild(); child; child = child->nextOnLine())
+        invalidteDisplayItemClientsOfInlineBoxRecursively(*child);
 }
+
+void LayoutBlockFlow::invalidateDisplayItemClientsOfFirstLine()
+{
+    if (childrenInline()) {
+        // This block has the first line.
+        if (RootInlineBox* firstRootBox = this->firstRootBox())
+            invalidteDisplayItemClientsOfInlineBoxRecursively(*firstRootBox);
+        return;
+    }
+
+    // Let the first child flow find the first line.
+    LayoutObject* child = firstChild();
+    while (child && child->isFloatingOrOutOfFlowPositioned())
+        child = child->nextSibling();
+    if (child && child->isLayoutBlockFlow())
+        toLayoutBlockFlow(child)->invalidateDisplayItemClientsOfFirstLine();
+}
+
+}