Re: DEVEL: Help with feature implementation

"Aiyee Bee" [off-list ref] writes:

Maybe a more practical (but still pretty unusual) solution would be adding
counters to each commit that tell us how many times they have been traversed
Through various histories?

The "--show-forkpoints" output shown there at http://ix.io/2Ms6
looks interesting.  I think you'd need only 1 bit counter
(i.e. "have we visited it only once, or more than once" bit) for
your purpose?  You traverse from F and Z and the first time you
reach C (probably through the F->E->D->C path), you see no SEEN flag
on the object so leave the new bit alone, and then when the traverse
reaches C again (this time through the Z->Y->C path), while stopping
further traversal because you notice C is already SEEN, you mark it
with the new bit so record that it has been visited at least twice.