UNDO does not seem to reliably serialize its restore operations. I have experienced situations in which a single UNDO restores all objects to the positions they occupied after the most recent UNDO. At other times, I have experienced a partial serialization (for example, one UNDO may restore two objects at once, then one at a time thereafter)
For example: In my most recent case, I move three triggers (and ensure I select only one at a time). Then a single UNDO relocates all three triggers instead of just the last trigger moved. This behavior was repeatable until I closed the score and reopened.
Presently I’m not certain how to reliably reproduce this phenomenon.
Undo (and now Redo) functions have been improved and are now working on IanniX 0.8.21 (release is scheduled for tonight or tomorrow morning, Paris time).
Looking forward to the next version!