Don't invalidate rect if it's covered by fully invalidated parent's visual rect

third_party/WebKit/Source/core/layout/LayoutObject.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2012 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 539 matching lines @@
     return node() && node()->hasTagName(HTMLNames::bodyTag);
   }
   bool isHR() const;
   bool isLegend() const;
 
   bool isTablePart() const {
     return isTableCell() || isLayoutTableCol() || isTableCaption() ||
            isTableRow() || isTableSection();
   }
 
+  bool isTextOrSVGChild() const { return isText() || isSVGChild(); }
+
   inline bool isBeforeContent() const;
   inline bool isAfterContent() const;
   inline bool isBeforeOrAfterContent() const;
   static inline bool isAfterContent(const LayoutObject* obj) {
     return obj && obj->isAfterContent();
   }
 
   bool hasCounterNodeMap() const { return m_bitfields.hasCounterNodeMap(); }
   void setHasCounterNodeMap(bool hasCounterNodeMap) {
     m_bitfields.setHasCounterNodeMap(hasCounterNodeMap);
@@ skipping 1552 matching lines @@
 
   Color selectionColor(int colorProperty, const GlobalPaintFlags) const;
 
   void removeShapeImageClient(ShapeValue*);
   void removeCursorImageClient(const CursorList*);
 
 #if DCHECK_IS_ON()
   void checkBlockPositionedObjectsNeedLayout();
 #endif
 
-  bool isTextOrSVGChild() const { return isText() || isSVGChild(); }
-
   static bool isAllowedToModifyLayoutTreeStructure(Document&);
 
   // Returns the parent for paint invalidation. For LayoutView, returns the
   // owner layout object in the containing frame if any, or nullptr.
   inline LayoutObject* paintInvalidationParent() const;
   LayoutObject* slowPaintInvalidationParentForTesting() const;
 
   void invalidatePaintForSelection();
 
   RefPtr<ComputedStyle> m_style;
@@ skipping 630 matching lines @@
 CORE_EXPORT void showLineTree(const blink::LayoutObject*);
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1);
 // We don't make object2 an optional parameter so that showLayoutTree
 // can be called from gdb easily.
 CORE_EXPORT void showLayoutTree(const blink::LayoutObject* object1,
                                 const blink::LayoutObject* object2);
 
 #endif
 
 #endif  // LayoutObject_h