Bug 108732

Summary:	Sometimes ScrollingTreeFixedNodes are left in the scrolling tree
Product:	WebKit	Reporter:	Simon Fraser (smfr) <simon.fraser>
Component:	Layout and Rendering	Assignee:	Simon Fraser (smfr) <simon.fraser>
Status:	RESOLVED DUPLICATE
Severity:	Normal	CC:	bdakin, simon.fraser
Priority:	P2
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified

Description Simon Fraser (smfr) 2013-02-01 17:46:35 PST

I've noticed that we can end up with several ScrollingTreeFixedNodes in the scrolling tree even when the page has only one fixedpos element. This happens if the page toggles elements from fixed to non-fixed; e.g. the top bar on http://www.redfin.com/CA/Mountain-View/1075-Space-Park-Way-94043/unit-297/home/21854852

It occurs because RenderLayer::clearBacking() doesn't hit removeViewportConstrainedLayer() when we're destroying the RenderLayer via removeOnlyThisLayer().

Comment 1 Simon Fraser (smfr) 2013-02-01 18:05:21 PST

> It occurs because RenderLayer::clearBacking() doesn't hit removeViewportConstrainedLayer() when we're destroying the RenderLayer via removeOnlyThisLayer().

Actually it does. Something else is happening but I'm not sure what.

Comment 2 Simon Fraser (smfr) 2013-02-11 13:30:52 PST


*** This bug has been marked as a duplicate of bug 109348 ***