[Bug 2752] New: Software cursor flickers when invisible windows change under it

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https://bugs.freedesktop.org/show_bug.cgi?id=2752          
     
           Summary: Software cursor flickers when invisible windows change
                    under it
           Product: xorg
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Server/general
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: sandmann at daimi.au.dk


See 

    https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=144022

The approach I suggested there (check if the area is actually visible) 
is not going to fix anything that a simple check for viewability won't
because the cursor already gets removed when an area below it gets damaged,
even if that area is not visible.

The patch I'm attaching has already been committed to HEAD, but it's a safe 
change so I'm nominating it for 6.8.3.          
     
     
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