If the pixmap does not actually change in set_window_pixmap(), there is
no need to invalidate the pending stream, if there's one.
Signed-off-by: Olivier Fourdan <ofourdan@redhat.com>
Suggested-by: Michel Dänzer <mdaenzer@redhat.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>