Invalidate first line display item clients when first line style changes

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 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 1406 matching lines @@
 void LayoutInline::invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer, PaintInvalidationReason invalidationReason, const LayoutRect* paintInvalidationRect) const
 {
     LayoutBoxModelObject::invalidateDisplayItemClients(paintInvalidationContainer, invalidationReason, paintInvalidationRect);
 
     // Use the paintInvalidationRect of LayoutInline for inline boxes, which saves the cost to calculate paint invalidation rect
     // for every inline box. This won't cause more rasterization invalidations because the whole LayoutInline is being invalidated.
     for (InlineFlowBox* box = firstLineBox(); box; box = box->nextLineBox())
         paintInvalidationContainer.invalidateDisplayItemClientOnBacking(*box, invalidationReason, paintInvalidationRect);
 }
 
+void LayoutInline::invalidateDisplayItemClientsOfFirstLine()
+{
+    if (alwaysCreateLineBoxes()) {
+        for (InlineFlowBox* box = firstLineBox(); box; box = box->nextLineBox()) {
+            if (!box->isFirstLineStyle())
+                break;
+            box->invalidateDisplayItemClientsOfFirstLine();
+        }
+        return;
+    }
+
+    for (LayoutObject* child = firstChild(); child; child = child->nextSibling()) {
+        child->setShouldDoFullPaintInvalidation();
+        if (child->isLayoutInline())
+            toLayoutInline(child)->invalidateDisplayItemClientsOfFirstLine();
+        else if (child->isText())
+            toLayoutText(child)->invalidateDisplayItemClientsOfFirstLine();
+    }
+}
+
 } // namespace blink