Undo/Redo functionality seems inconsistent

[mortenbeta]

Hitting Undo seems to have slightly erratic behaviour; namely when making both a graphical and a code change since the last save.
Hitting Redo does not necessarily get you back to the same state as before hitting undo.

[quantum-leaps]

This is a known and quite a tricky and complex issue. The overhaul of the undo/redo functionality in QM is planned...