widget: call gl-draw when skipping draw
widget: call gl-draw when skipping draw

It's a bad idea to hold the GL scanout for a long time, especially in
error cases. (fwiw, qemu has 1s tolerance before complaining, and the
guest is most likely going to hang meanwhile, stuck on the GPU)

Signed-off-by: Marc-André Lureau <a6f2b960a4aca61381fc650a67901b2ac8e83e6d@redhat.com>
Acked-by: Victor Toso <39b7599ff73bbf5db531748ba5250f21fa7120ff@redhat.com>

flexVDI/spice-gtk,flexVDI/spice-gtk