ignore maximize events for clients using xdg-shell v5 and newer

dwl.c

@@ -1587,9 +1587,14 @@ maximizenotify(struct wl_listener *listener, void *data)
 	 * typically because the user clicked on the maximize button on
 	 * client-side decorations. dwl doesn't support maximization, but
 	 * to conform to xdg-shell protocol we still must send a configure.
+	 * Since xdg-shell protocol v5 we should ignore request of unsupported
+	 * capabilities, just schedule a empty configure when the client uses <5
+	 * protocol version
 	 * wlr_xdg_surface_schedule_configure() is used to send an empty reply. */
 	Client *c = wl_container_of(listener, c, maximize);
-	wlr_xdg_surface_schedule_configure(c->surface.xdg);
+	if (wl_resource_get_version(c->surface.xdg->resource)
+			< XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION)
+		wlr_xdg_surface_schedule_configure(c->surface.xdg);
 }
 
 void