xwayland: Update screen pixmap on output resize

Olivier Fourdan requested to merge ofourdan/xserver:issue834 into master

Running Xwayland non-rootless and resizing the output would lead to a crash while trying to update the larger areas of the root window.

Make sure we resize the backing pixmap according to the new output size to avoid the crash.

Signed-off-by: Olivier Fourdan ofourdan@redhat.com Closes: #834 (closed)

Edited by Olivier Fourdan

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