[Webkit-unassigned] [Bug 282727] New: updateAllowsBackingStoreDetaching has wrong coordinates when inside an animated transform

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=282727

            Bug ID: 282727
           Summary: updateAllowsBackingStoreDetaching has wrong
                    coordinates when inside an animated transform
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

When descending through a layer that has an animated transform, the layerExtent is computed using the post-transform animation extents and the transform itself isn't pushed onto the geometry map.

That means for all descendants, overlap bounds are no longer 'absolute', since they aren't transformed.

This generally works ok for overlap testing, since everything within the transform stacking context is in the same coordinate space.

updateAllowsBackingStoreDetaching compares these untransformed coordinates against the layout viewport though, and this is invalid, leading to backing stores not being detached.

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