libweston-desktop/xdg_shell_v6: Send error on wrongly-sized buffer

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Reviewed-by: Daniel Stone <daniels@collabora.com>

libweston-desktop/xdg-shell-v6.c

@@ -625,7 +625,6 @@ weston_desktop_xdg_toplevel_committed(struct weston_desktop_xdg_toplevel *toplev
 {
 	struct weston_surface *wsurface =
 		weston_desktop_surface_get_surface(toplevel->base.desktop_surface);
-	bool reconfigure = false;
 
 	if (!wsurface->buffer_ref.buffer && !toplevel->added) {
 		weston_desktop_xdg_toplevel_ensure_added(toplevel);
@@ -634,14 +633,20 @@ weston_desktop_xdg_toplevel_committed(struct weston_desktop_xdg_toplevel *toplev
 	if (!wsurface->buffer_ref.buffer)
 		return;
 
-	if (toplevel->next_state.maximized || toplevel->next_state.fullscreen)
-		reconfigure =
-			( ( toplevel->requested_size.width != wsurface->width ) ||
-			  ( toplevel->requested_size.height != wsurface->height ) );
+	if ((toplevel->next_state.maximized || toplevel->next_state.fullscreen) &&
+	    (toplevel->requested_size.width != wsurface->width ||
+	     toplevel->requested_size.height != wsurface->height)) {
+		struct weston_desktop_client *client =
+			weston_desktop_surface_get_client(toplevel->base.desktop_surface);
+		struct wl_resource *client_resource =
+			weston_desktop_client_get_resource(client);
+
+		wl_resource_post_error(client_resource,
+				       ZXDG_SHELL_V6_ERROR_INVALID_SURFACE_STATE,
+				       "xdg_surface buffer does not match the configured state");
+		return;
+	}
 
-	if (reconfigure) {
-		weston_desktop_xdg_surface_schedule_configure(&toplevel->base);
-	} else {
 	toplevel->state = toplevel->next_state;
 	toplevel->min_size = toplevel->next_min_size;
 	toplevel->max_size = toplevel->next_max_size;
@@ -650,7 +655,6 @@ weston_desktop_xdg_toplevel_committed(struct weston_desktop_xdg_toplevel *toplev
 				     toplevel->base.desktop_surface,
 				     sx, sy);
 }
-}
 
 static void
 weston_desktop_xdg_toplevel_close(struct weston_desktop_xdg_toplevel *toplevel)