Mark when we may have been invalidated to early out on repaintTreeAfterLayout.

Source/core/rendering/RenderTableSection.cpp

Index: Source/core/rendering/RenderTableSection.cpp
diff --git a/Source/core/rendering/RenderTableSection.cpp b/Source/core/rendering/RenderTableSection.cpp
index e594892ca244c1416edd9b8852b8d6c6594f41ca..0758794586ada0093bfc10a484dcfa337aedab21 100644
--- a/Source/core/rendering/RenderTableSection.cpp
+++ b/Source/core/rendering/RenderTableSection.cpp
@@ -731,6 +731,8 @@ void RenderTableSection::layout()
     ASSERT(!needsCellRecalc());
     ASSERT(!table()->needsSectionRecalc());
 
+    setMayNeedInvalidation(true);
+
     // addChild may over-grow m_grid but we don't want to throw away the memory too early as addChild
     // can be called in a loop (e.g during parsing). Doing it now ensures we have a stable-enough structure.
     m_grid.shrinkToFit();
@@ -751,6 +753,8 @@ void RenderTableSection::layout()
             if (!cell || current.inColSpan)
                 continue;
 
+            cell->setMayNeedInvalidation(true);
+
             unsigned endCol = startColumn;
             unsigned cspan = cell->colSpan();
             while (cspan && endCol < cols) {
@@ -914,6 +918,8 @@ void RenderTableSection::layoutRows()
             if (!cell || cs.inColSpan)
                 continue;
 
+            cell->setMayNeedInvalidation(true);
+
             int rowIndex = cell->rowIndex();
             int rHeight = m_rowPos[rowIndex + cell->rowSpan()] - m_rowPos[rowIndex] - vspacing;