Undo bug

[UUUUR]

When using undo, move counter is increased by 1 instead decreased.
But, using undo when move counter is 1, move counter becomes 0.

[joemanaco]

Nice find. I can confirm it. Have put it on my to do list and hope to finde some time next week to fix it (ToDo added: https://trello.com/c/f4tp0G1y/1-bug-undo-counter)