Improve handling of PaintInvalidationLayer (renamed to PaintInvalidationSubtree)

third_party/WebKit/Source/core/layout/LayoutTable.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, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 1424 matching lines @@
         if (!section->isTableSection())
             continue;
         for (LayoutTableRow* row = toLayoutTableSection(section)->firstRow(); row; row = row->nextRow()) {
             for (LayoutTableCell* cell = row->firstCell(); cell; cell = cell->nextCell()) {
                 ColAndColGroup colAndColGroup = colElementAtAbsoluteColumn(cell->absoluteColumnIndex());
                 LayoutTableCol* column = colAndColGroup.col;
                 LayoutTableCol* columnGroup = colAndColGroup.colgroup;
                 // Table cells paint container's background on the container's backing instead of its own (if any),
                 // so we must invalidate it by the containers.
                 bool invalidated = false;
-                if ((columnGroup && columnGroup->shouldDoFullPaintInvalidation())
+                if (childPaintInvalidationState.forcedSubtreeFullInvalidationWithinContainer()

[chrishtr, 2016/05/09 22:20:42]

Why the change here?

+                    || (columnGroup && columnGroup->shouldDoFullPaintInvalidation())
                     || (column && column->shouldDoFullPaintInvalidation())
                     || section->shouldDoFullPaintInvalidation()) {
                     section->invalidateDisplayItemClient(*cell);
                     invalidated = true;
                 }
                 if ((!invalidated || row->isPaintInvalidationContainer()) && row->shouldDoFullPaintInvalidation())
                     row->invalidateDisplayItemClient(*cell);
             }
         }
     }
@@ skipping 27 matching lines @@
 
 LayoutUnit LayoutTable::paddingRight() const
 {
     if (collapseBorders())
         return LayoutUnit();
 
     return LayoutBlock::paddingRight();
 }
 
 } // namespace blink