backend/wayland: dispatch remote display when waiting for a configure event

We don't need to process all events, only those that come from the host
compositor. This also avoids running user event handlers while in the
middle of committing an output.

Fixes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3857

backend/wayland/output.c

@@ -585,8 +585,8 @@ static bool output_commit(struct wlr_output *wlr_output,
 
 		wl_display_flush(output->backend->remote_display);
 		while (!output->configured) {
-			if (wl_event_loop_dispatch(output->backend->event_loop, -1) == -1) {
+			if (wl_display_dispatch(output->backend->remote_display) == -1) {
-				wlr_log(WLR_ERROR, "wl_event_loop_dispatch() failed");
+				wlr_log(WLR_ERROR, "wl_display_dispatch() failed");
 				return false;
 			}
 		}