108732 2013-02-01 17:46:35 -0800 Sometimes ScrollingTreeFixedNodes are left in the scrolling tree 2013-02-11 13:30:52 -0800 1 1 1 Unclassified WebKit Layout and Rendering 528+ (Nightly build) Unspecified Unspecified RESOLVED DUPLICATE 109348 P2 Normal --- 1 simon.fraser simon.fraser bdakin simon.fraser oldest_to_newest 823468 0 simon.fraser 2013-02-01 17:46:35 -0800 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(). 823472 1 simon.fraser 2013-02-01 18:05:21 -0800 > 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. 830052 2 simon.fraser 2013-02-11 13:30:52 -0800 *** This bug has been marked as a duplicate of bug 109348 ***