wrap indicator for grid

src/rt/elements/wrapindicator.ts

@@ -0,0 +1,9 @@
+import { horizontal_wrap } from "./layout";
+
+import create from "./create";
+
+export default function wrapindicator() {
+	const wi_layout = horizontal_wrap()
+	wi_layout.appendChild(create("div", "wrap-indicator"))
+	return wi_layout
+}