Refactor Control autofocus to be handled by control type instead of as part of base.OnMouseDown

Source/Editor/Content/GUI/ContentView.cs

@@ -597,6 +597,14 @@ namespace FlaxEditor.Content.GUI
             }
         }
 
+        /// <inheritdoc />
+        public override bool OnMouseDown(Vector2 location, MouseButton button)
+        {
+            if (base.OnMouseDown(location, button))
+                return true;
+            return AutoFocus && Focus(this);
+        }
+
         /// <inheritdoc />
         public override bool OnMouseWheel(Vector2 location, float delta)
         {