[Webkit-unassigned] [Bug 5909] overlapping element leaves trail when scrolling iframe (affects Gmail)

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=5909


koivisto at iki.fi changed:

           What    |Removed                     |Added
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  Attachment #12985|                            |review?
               Flag|                            |
         AssignedTo|webkit-                     |koivisto at iki.fi
                   |unassigned at lists.webkit.org |




------- Comment #18 from koivisto at iki.fi  2007-02-06 15:11 PDT -------
Created an attachment (id=12985)
 --> (http://bugs.webkit.org/attachment.cgi?id=12985&action=view)
check layer hierarchy for overlap

Crawl the layer hierarchy for potential frame overlaps, use slow repaints if
something is found. It should handle common cases well and does not activate
slow repaints unnecessarily.

Check is done from frame paint() which is not too nice. Don't know where else
to put it, layer positioning is sort-of paint time thing. Caching could speed
it up in expense of added compexity. Not sure if it is really worthwhile.


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