Comment # 1 on bug 1130392 from Steffen Winterfeldt

Hm, maybe that was not clear enough. ;-/

The test case in bug 1130227 tries to create /, /home and swap on 3 disks.
Each disk has enough size for one minimal volume but not a desired one (except
for swap). swap is optional.

The outcome is that / and /home are proposed, swap not.

If you make swap mandatory, all 3 volumes are proposed (one per disk).

That's because swap gets disabled permanently in the proposal process
after the first failed attempt.