Take continuation into consideration when calculating absoluteClippedOverflowRect.

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 91dc4f0ef784e45710543f4112b1e86ffe768666..1cdcb922a2b516ac981d6dd1725d720589afa154 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -861,7 +861,7 @@ public:
 
     // Returns the rect that should have paint invalidated whenever this object changes. The rect is in the view's
     // coordinate space. This method deals with outlines and overflow.
-    LayoutRect absoluteClippedOverflowRect() const;
+    virtual LayoutRect absoluteClippedOverflowRect() const;

[pdr., 2014/12/02 21:56:21]

Can you just update RenderInline::clippedOverflowRectForPaintInvalidation
instead of making this virtual?

[c.shu, 2014/12/02 22:16:31]

I put the code in absoluteClippedOverflowRect for performance consideration.
clippedOverflowRectForPaintInvalidation is called by many other places. Putting
the code in here would have many duplications in calculation and cause
performance regression in rendering, I believe.
Another way to avoid making absoluteClippedOverflowRect virtual is to check if
isRenderInline in the base. What do you think?

[pdr., 2014/12/03 22:11:17]

Remember that making a function virtual pretty much* adds an if statement to all
calls to absoluteClippedOverflowRect for all render objects. I'm not yet sure
where this is being called from (see previous comment) so I can't comment on
which approach will be best.

[c.shu, 2014/12/03 22:27:27]

There are only a few callers,
1. hasOffscreenRect in SpatialNavigation.cpp
2. HTMLAreaElement::computePath
3. writePositionAndStyle in SVGRenderTreeAsText.cpp
All of them are in uncommon code path.
However, clippedOverflowRectForPaintInvalidation is a common function in the
rendering code.

     virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const;
     virtual LayoutRect rectWithOutlineForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, LayoutUnit outlineWidth, const PaintInvalidationState* = 0) const;