faster paint tree traversal

[Dirk Mueller]

On Wednesday 11 February 2004 05:55, David Hyatt wrote:

> BTW, isRoot was slow for us too, because of documentElement() being
> slow.  I fixed this (or at least improved it) by making a faster
> documentElement() for HTMLDocument, but an even better fix might be to
> stash the root in this new PaintInfo struct.

This is the patch. Comments? it will also set overhangingContents for 
RenderCanvas, though that doesn't hurt IMHO.


Dirk
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