[Bug] Flickering on dragging link from primitive node over widgets

[huchenlei]

flickering_widget.mp4

I think we should have 2 widget hover condition, one on the outer square bounding box and one on the inner rounded corner bounding box. There should be no space between these outer bounding boxes. This way we don't get flickering of links when user tries to drag a link over a list of primitive nodes.

[webfiltered]

I might have forgotten to mention it - my thought was that we just remove the 2px gap between widgets.

Sorry to clarify - there's no rounded hitbox. The *left arrow hitbox is also oversized (bad math in the combo / number code) - plan to fix this during clean up of remaining pointer handlers.