oc-search porting to flutter (missing compose + workflow editor)

lib/utils/arrow_clipper.dart

@@ -0,0 +1,17 @@
+import 'package:flutter/material.dart';
+
+class ArrowClipper extends CustomClipper<Path> {
+  @override
+  Path getClip(Size size) {
+    Path path = Path();
+    path.moveTo(0, size.height);
+    path.lineTo(size.width / 2, size.height / 2);
+    path.lineTo(size.width, size.height);
+    return path;
+  }
+
+  @override
+  bool shouldReclip(CustomClipper<Path> oldClipper) {
+    return true;
+  }
+}