The default highlight for a GoBasicNode (a thin rectangle around
the node’s bounding box) isn’t visible enough for my application.
However, I can’t find where that rectangle’s stroke width or color
are specified. Does anyone know?
(I’m not 100% sure I’m actually getting default behavior, but
I started with the FlowCharter example, and I also don’t
see in it where the details of the highlight rectangles are