xdg-shell: improve validation of resize edges

The current validation doesn't catch some invalid values such as 3 or 7.

types/xdg_shell/wlr_xdg_toplevel.c

@@ -313,7 +313,17 @@ static void xdg_toplevel_handle_resize(struct wl_client *client,
 	struct wlr_seat_client *seat =
 		wlr_seat_client_from_resource(seat_resource);
 
-	if (edges > XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT) {
+	switch (edges) {
+	case XDG_TOPLEVEL_RESIZE_EDGE_TOP:
+	case XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM:
+	case XDG_TOPLEVEL_RESIZE_EDGE_LEFT:
+	case XDG_TOPLEVEL_RESIZE_EDGE_RIGHT:
+	case XDG_TOPLEVEL_RESIZE_EDGE_TOP_LEFT:
+	case XDG_TOPLEVEL_RESIZE_EDGE_TOP_RIGHT:
+	case XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_LEFT:
+	case XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT:
+		break;
+	default:
 		wl_resource_post_error(toplevel->base->resource,
 			XDG_TOPLEVEL_ERROR_INVALID_RESIZE_EDGE,
 			"provided value is not a valid variant of the resize_edge enum");