Bug(s) when undoing tau synchronization

[aubertc]

I'm using the dev version IRDC-4.3.5.1.jar, and have a very strange bug:

java -jar IRDC*.jar --interactive "Tau{a}[k1] | Tau{a}[k1].Tau{b}[k2] | Tau{b}[k2]"
------| Actionable Labels |------
[0] [k2]
[1] [k0]
[q] Quit program
------------
((Tau{a}[k0].0|Tau{a}[k0].Tau{b}[k2].0)|Tau{b}[k2].0)
Please input the index of the label you'd like to act on:
1
((Tau{a}[k0].0|Tau{a}[k0].Tau{b}[k2].0)|Tau{b}[k2].0) ~[k0]~> ((a|Tau{a}[k0].Tau{b}[k2].0)|Tau{b}[k2].0)
------| Actionable Labels |------
[0] [k2]
[1] a
[q] Quit program
------------
((a|Tau{a}[k0].Tau{b}[k2].0)|Tau{b}[k2].0)
Please input the index of the label you'd like to act on:

1. The program renamed the keys, but that's ok.
2. In ((Tau{a}[k0].0|Tau{a}[k0].Tau{b}[k2].0)|Tau{b}[k2].0), I should not be allowed to undo k0 (since I need to undo k2 first).
3. If I still decide to undo k0, then only the "left part" of the synchronization is undone

I don't know how those three observations relate, but there's definitely something off!

[aubertc]

Very nice, thanks.