Invalidate DisplayItemClient when selection state changes

Source/core/layout/LayoutObject.cpp

Index: Source/core/layout/LayoutObject.cpp
diff --git a/Source/core/layout/LayoutObject.cpp b/Source/core/layout/LayoutObject.cpp
index 2fa594d795b58033d5ff04abe59b35de5c51df22..1f28cd8a7fa190c8435d0533bd0372875159d123 100644
--- a/Source/core/layout/LayoutObject.cpp
+++ b/Source/core/layout/LayoutObject.cpp
@@ -3015,6 +3015,16 @@ CursorDirective LayoutObject::getCursor(const LayoutPoint&, Cursor&) const
     return SetCursorBasedOnStyle;
 }
 
+void LayoutObject::setSelectionState(SelectionState state)
+{
+    if (selectionState() == state)
+        return;
+
+    m_bitfields.setSelectionState(state);
+    invalidateDisplayItemClient(DisplayItemClientData(*this));

[Xianzhu, 2015/03/18 16:10:07]

Alternative way is to call 'if slimmingPaintEnabled)
setShouldDoFullPaintInvalidation()' here. I prefer it because it's faster.
invalidateDisplayItemClient involves walking up the layout tree to find paint
invalidation container.

+}
+
+
 bool LayoutObject::canUpdateSelectionOnRootLineBoxes() const
 {
     if (needsLayout())