[Bug 71260] New: SNA in zaphod mode (multiple screens) has rendering issues with Xnest

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71260

          Priority: medium
            Bug ID: 71260
          Assignee: chris at chris-wilson.co.uk
           Summary: SNA in zaphod mode (multiple screens) has rendering
                    issues with Xnest
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: intelgraphics7 at gmx-topmail.de
          Hardware: x86 (IA32)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

In zaphod mode (i.e. two screens) when running Xnest I get rendering
corruptions when I i.e. move a xfce-terminal window over another xfce-terminal
window.

The problem becomes even more obvious when having the Xnest window spanning
across the two screens and then moving windows within the Xnest session across
screen borders. The contents of the moving window is rarely rendered at all.

Since this issue mainly happens within Xnest, I guess it has to do with area
copying of child of child of child windows or so.

Xnest works fine when not having the zaphod mode active meaning only one
physical X screen configured even if it spans two outputs.

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