[Webkit-unassigned] [Bug 110552] New: background-attachment: fixed causes redraw issues when applied to element alongside transform: perspective

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=110552

           Summary: background-attachment: fixed causes redraw issues when
                    applied to element alongside transform: perspective
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: peter.lejeck at gmail.com


Created an attachment (id=189677)
 --> (https://bugs.webkit.org/attachment.cgi?id=189677&action=review)
Test Case Reduction

Redraws for fixed backgrounds don't appear to be triggered automatically when applied to the same DOM node as a 3D CSS transform.

Steps to Reproduce:
1) Apply 3D CSS Transform to same node as a fixed-attachment background. (see attached test case for example)
2) Scroll down.
3) Force a redraw (partial or whole).  This can be done by (a) selecting text within the bounding box for a partial redraw or (b) resizing the window for a full redraw

Actual Results:
Visual tearing for partial redraws, and complete repositioning of background for full redraws.

Expected Results:
Background should behave as background-attachment: fixed, staying in one place while you scroll.

Platforms Confirmed:
Mac OS 10.8.2, Chrome 24.0.1312.57
Mac OS 10.8.2, WebKit Nightly 537.32+
Windows 8, Chrome 25.0.1364.97 (channel m)

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