compositor-wayland: Call set_window_geometry when using zxdg_shell_v6

This way Wayland compositors will be aware of Weston's
"visible bounds" (and ignore its shadows).

Signed-off-by: Sergi Granell <xerpi.g.12@gmail.com>
Reviewed-by: Quentin Glidic <sardemff7+git@sardemff7.net>
1 file changed