simple "match" button or icon for bi-directional connector terminating arrow styles

[pjuska01]

By default, a line has an arrow only at one end. To make a connector a bi-directional flow, the user must manually inspect the existing arrow head and find the arrow head style that matches it. The styles are very similar and the differences very nuanced.

A simple icon or button to "match" the existing selected arrow head on the other end of the line would be useful.

If it already has two endings selected, and they are different, I would suggest the "match" button should either favor (a) whichever arrowhead type is most commonly used elsewhere in the document, or (b) favor the target side, which likely was the 1st drawn, over the origin side, which was likely added later.