[Bug 66991] New: Scrolling broken with window on top [SNA] in 2.21.12

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66991

          Priority: medium
            Bug ID: 66991
          Assignee: chris at chris-wilson.co.uk
           Summary: Scrolling broken with window on top [SNA] in 2.21.12
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: linuxhippy at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Created attachment 82536
  --> https://bugs.freedesktop.org/attachment.cgi?id=82536&action=edit
screenshot

On my SNB laptop (running xfce with no composition manager), when scrolling
within an application which has a window on top, the background application
isn't re-painted with 2.21.12.
Instead, the content of the top-level window is "scrolled".

Please find a screenshot of the issue attached.

Side note: Current git ( 3f3071c6c91c3907cb0fecf2f69a995feefe7956 ) is
completely broken on my system. Scrolling doesn't seem to honor clipping and I
get frequent crashes.

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