wayland/egl: Ensure EGL surface is resized on DRI update_buffers()

Fullscreening and unfullscreening a totem window while playing a video sometimes results in the video subsurface not changing size along. This is also reproducible with epiphany.

If a surface gets resized while we have an active back buffer for it, the resized dimensions won't get neither immediately applied on the resize callback, nor correctly synchronized on update_buffers(), as the (now stale) surface size and currently attached buffer size still do match.

There's actually 2 things to synchronize here, first the surface query size might not be updated yet to the wl_egl_window's (i.e. resize_callback happened while there is a back buffer), and second the wayland buffers would need dropping if new surface size differs with the currently attached buffer. These are done in separate steps now.

v2: Added the 'Fixes' tag

https://bugzilla.redhat.com/show_bug.cgi?id=1650929

Fixes: a9fb331e ("wayland/egl: update surface size on window resize") Signed-off-by: Carlos Garnacho carlosg@gnome.org Tested-by: Bastien Nocera hadess@hadess.net