tinywl: drop focused surface check for interactive ops

This serves as a bad example: compositors should validate serials from
events instead. Also, the current implementation segfaults if
focused_surface is NULL.

tinywl/tinywl.c

@@ -712,13 +712,7 @@ static void begin_interactive(struct tinywl_toplevel *toplevel,
 	 * compositor stops propegating pointer events to clients and instead
 	 * consumes them itself, to move or resize windows. */
 	struct tinywl_server *server = toplevel->server;
-	struct wlr_surface *focused_surface =
+
-		server->seat->pointer_state.focused_surface;
-	if (toplevel->xdg_toplevel->base->surface !=
-			wlr_surface_get_root_surface(focused_surface)) {
-		/* Deny move/resize requests from unfocused clients. */
-		return;
-	}
 	server->grabbed_toplevel = toplevel;
 	server->cursor_mode = mode;