wizjany 05cee0a30b Don't overwrite history during changes.
Fixes issues with some changes not being undone.

I mean, the sphere algorithm needs to not set blocks 20 times,
but other things can trigger this too.

Also allow radius 0 sphere via //sphere (because /br sphere allows it).
2019-07-16 21:43:14 -04:00
..
2019-07-12 13:49:45 -07:00