Undo is Cntrl+Z, but why doesn't Cntrl+Y work?
Because... nobody has coded Ctrl-Y to do anything? Just a guess.
There is a Redo button but it doesn't see finished.
Well, could someone code it please? It's really annnoying.
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Some keyboards, especially in central and eastern European countries, have Z and Y keys swapped. *shrug*
I'm quite sure he means "Redo", which is usually mapped as Ctrl+Y