Paint collapsed borders of a table as one display item

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

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 42 matching lines @@
 
   LayoutTable* table = this->table();
   if (!table)
     return;
 
   // TODO(dgrogan): Is the "else" necessary for correctness or just a brittle
   // optimization? The optimization would be: if the first branch is taken then
   // the next one can't be, so don't even check its condition.
   if (!table->selfNeedsLayout() && !table->normalChildNeedsLayout() &&
       oldStyle->border() != style()->border()) {
-    table->invalidateCollapsedBorders();
+    table->invalidateCollapsedBorders(PaintInvalidationStyleChange);
   } else if ((oldStyle->logicalWidth() != style()->logicalWidth()) ||
              LayoutTableBoxComponent::doCellsHaveDirtyWidth(*this, *table, diff,
                                                             *oldStyle)) {
     // TODO(dgrogan): Optimization opportunities:
     // (1) Only mark cells which are affected by this col, not every cell in the
     //     table.
     // (2) If only the col width changes and its border width doesn't, do the
     //     cells need to be marked as needing layout or just given dirty
     //     widths?
     table->markAllCellsWidthsDirtyAndOrNeedsLayout(
@@ skipping 119 matching lines @@
 const BorderValue& LayoutTableCol::borderAdjoiningCellAfter(
     const LayoutTableCell* cell) const {
   DCHECK_EQ(table()
                 ->colElementAtAbsoluteColumn(cell->absoluteColumnIndex() - 1)
                 .innermostColOrColGroup(),
             this);
   return style()->borderEnd();
 }
 
 }  // namespace blink