Editor stuff

Assets/Plugins/com.unity.uiextensions/Runtime/Scripts/Utilities/NonDrawingGraphic.cs

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+/// Credit Slipp Douglas Thompson 
+/// Sourced from - https://gist.github.com/capnslipp/349c18283f2fea316369
+
+namespace UnityEngine.UI.Extensions
+{
+    /// A concrete subclass of the Unity UI `Graphic` class that just skips drawing.
+    /// Useful for providing a raycast target without actually drawing anything.
+    [AddComponentMenu("Layout/Extensions/NonDrawingGraphic")]
+    public class NonDrawingGraphic : MaskableGraphic
+    {
+        public override void SetMaterialDirty() { return; }
+        public override void SetVerticesDirty() { return; }
+
+        /// Probably not necessary since the chain of calls `Rebuild()`->`UpdateGeometry()`->`DoMeshGeneration()`->`OnPopulateMesh()` won't happen; so here really just as a fail-safe.
+        protected override void OnPopulateMesh(VertexHelper vh)
+        {
+            vh.Clear();
+            return;
+        }
+    }
+}