trigger bg change on config reload

sway/commands.c

@@ -1692,12 +1692,16 @@ static struct cmd_results *cmd_output(int argc, char **argv) {
 		swayc_t *cont = NULL;
 		for (int i = 0; i < root_container.children->length; ++i) {
 			cont = root_container.children->items[i];
-			if (cont->name && strcmp(cont->name, output->name) == 0) {
+			if (cont->name && ((strcmp(cont->name, output->name) == 0) || (strcmp(output->name, "*") == 0))) {
 				apply_output_config(output, cont);
+
+				if (strcmp(output->name, "*") != 0) {
+					// stop looking if the output config isn't applicable to all outputs
 					break;
 				}
 			}
 		}
+	}
 
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }