[graphviz]

This seems like it could be done in a little script in the graphviz gvpr processor.

Someone could implement this as a feature in graphviz. It might take a day to implement.

There are probably other "solutions" that already handle this more gracefully, but otherwise don't have a very complete set of features relative to graphviz.

It's reasonable (and constructive) for you to complain, but your "issue" is representative of a wide set of "issues" we've seen, and the real problem is we're just a little unimportant niche service and all this work is being done by volunteers and they mainly work on the things they know how to do.