[Webkit-unassigned] [Bug 15890] Most of www.aol.com still redraws unnecessarily when headline/photo section changes

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=15890





------- Comment #8 from mitz at webkit.org  2007-11-07 21:18 PDT -------
(In reply to comment #7)
> Most of the page only flashes when the first 5 news items initially load. 
> After they're done loading, much less of the page repaints after that.

Looking for things that trigger repainting outside the rotating story box, I
found a div (id="itrk") with visibility:hidden; position: absolute; bottom: 0
into which 1x1 images are loaded. Using Drosera I set a breakpoint in at
main.js:246 (in imp()), and indeed one such image is created for each story
when it is loaded. This is consistent with the excessive repainting only during
the first cycle.
It is kind of silly to repaint invisible objects, but we do it because they may
have visible descendants. We keep track of whether that is the case only at the
layer level.


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