x11drv: proper visible region handling for cached dces

[Frank Richter]

Frank Richter <frank.richter at gmail.com>
Fix issue where it could happen that, when a cached dce was reused, the
visible region was not updated although the window region had changed
since the last dce use. Now, track is kept of window region changes and
the visible region for a cached dce is updated if the window region
changed in the mean time.


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