[Webkit-unassigned] [Bug 5909] (Gmail) Absolutely positioned element over iframe incorrectly scrolls along with iframe, and leaves trail when scrolling

[bugzilla-daemon at opendarwin.org]

http://bugzilla.opendarwin.org/show_bug.cgi?id=5909





------- Comment #10 from hyatt at apple.com  2006-01-23 11:42 -------
I don't think we can do this for frameset frames.  The performance regression
would be way too large.  A better idea might be to do this only if you're an
iframe.  Even then, this isn't really the correct long-term fix, since we
really want an efficient way to know if something is obscured.

I think we should bite the bullet and fix this the right way.  We've need this
"Is something in front of me?" function for some time now.  Such a function
would be a sibling of paint and hitTest in the layer code.  It could walk the
layers to find this information out (and then a further optimization would be
to potentially cache such information for individual layers).

Fully occluded layers could even be culled out of painting and hit testing
entirely.


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