Comment 8 for bug 1787190

Something changed between v4 & v5 simply because I used this cleanup function numerous times, to the point of resolving an annoying segfault.

V4 NEVER left a single piece of unused track (going nowhere). Particularly the pile of microsegments that the router can produce while using moves.
And it also removed any kind of segments going nowhere but connected to a pad. And you know the router is able to produce near perfect circle segments entirely blended in a pad!

Cleanup is cleanup. Don't understand why it would preserve three segments in the middle of nowhere.

I use it as follow, numerous times:
-cut two or more tracks
-cleanup
-reroute the previously messy zone.