Return success when renaming a workspace to itself

sway/commands/rename.c

@@ -81,9 +81,13 @@ struct cmd_results *cmd_rename(int argc, char **argv) {
 	struct sway_workspace *tmp_workspace = workspace_by_name(new_name);
 	if (tmp_workspace) {
 		free(new_name);
+		if (tmp_workspace == workspace) {
+			return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+		} else {
 			return cmd_results_new(CMD_INVALID, "rename",
 					"Workspace already exists");
 		}
+	}
 
 	wlr_log(WLR_DEBUG, "renaming workspace '%s' to '%s'", workspace->name, new_name);
 	free(workspace->name);