[Webkit-unassigned] [Bug 63740] [Windows] Drawing Artifacts When Scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=63740





--- Comment #6 from Brent Fulgham <bfulgham at webkit.org>  2011-06-30 13:00:24 PST ---
Part of the problem seems to be the modification of the rect size (see the JavaScript routine 'adjustSelector', where the right-hand boundary of the rect is increased by the size of a button image (not used in the example).

It seems that when this is performed on a heading (which span the full width of the page), it forces the element width to extend beyond the page boundaries set during the initial layout.

This causes the scrollbar to pop-in on the bottom of the page.  At that point, the layout logic seems to get confused and the repaint problems start happening.

A workaround for now is to not increase the right-hand size of the rect, which prevents the last-minute scroll bar addition.  When I make that change, I no longer get drawing artifacts.

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