Fix laggy move-resize for wl-shell views

rootston/desktop.c

@@ -103,7 +103,9 @@ void view_resize(struct roots_view *view, uint32_t width, uint32_t height) {
 
 void view_move_resize(struct roots_view *view, double x, double y,
 		uint32_t width, uint32_t height) {
-	if (x == view->x && y == view->y) {
+	bool update_x = x != view->x;
+	bool update_y = y != view->y;
+	if (!update_x && !update_y) {
 		view_resize(view, width, height);
 		return;
 	}
@@ -113,7 +115,13 @@ void view_move_resize(struct roots_view *view, double x, double y,
 		return;
 	}
 
-	view_move(view, x, y);
+	view->pending_move_resize.update_x = update_x;
+	view->pending_move_resize.update_y = update_y;
+	view->pending_move_resize.x = x;
+	view->pending_move_resize.y = y;
+	view->pending_move_resize.width = width;
+	view->pending_move_resize.height = height;
+
 	view_resize(view, width, height);
 }
 

rootston/wl_shell.c

@@ -71,7 +71,24 @@ static void handle_set_state(struct wl_listener *listener, void *data) {
 }
 
 static void handle_surface_commit(struct wl_listener *listener, void *data) {
-	// TODO do we need to do anything here?
+	struct roots_wl_shell_surface *roots_surface =
+		wl_container_of(listener, roots_surface, surface_commit);
+	struct roots_view *view = roots_surface->view;
+	struct wlr_surface *wlr_surface = view->wlr_surface;
+
+	int width = wlr_surface->current->width;
+	int height = wlr_surface->current->height;
+
+	if (view->pending_move_resize.update_x) {
+		view->x = view->pending_move_resize.x +
+			view->pending_move_resize.width - width;
+		view->pending_move_resize.update_x = false;
+	}
+	if (view->pending_move_resize.update_y) {
+		view->y = view->pending_move_resize.y +
+			view->pending_move_resize.height - height;
+		view->pending_move_resize.update_y = false;
+	}
 }
 
 static void handle_destroy(struct wl_listener *listener, void *data) {

rootston/xwayland.c

@@ -186,10 +186,10 @@ static void handle_surface_commit(struct wl_listener *listener, void *data) {
 	struct roots_xwayland_surface *roots_surface =
 		wl_container_of(listener, roots_surface, surface_commit);
 	struct roots_view *view = roots_surface->view;
-	struct wlr_xwayland_surface *xwayland_surface = view->xwayland_surface;
+	struct wlr_surface *wlr_surface = view->wlr_surface;
 
-	int width = xwayland_surface->surface->current->width;
+	int width = wlr_surface->current->width;
-	int height = xwayland_surface->surface->current->height;
+	int height = wlr_surface->current->height;
 
 	if (view->pending_move_resize.update_x) {
 		view->x = view->pending_move_resize.x +