Request For Comments - Undo/Redo framework

Thomas Maisl exp-122004 at
Tue Feb 10 06:42:43 PST 2015

Am 10.02.2015 15:27:54 schrieb Davide Db: 
In many GUIs and applications Control+Z can be used to undo the last
action. In many applications earlier actions than the last one can also
be undone by pressing Control+Z multiple times. Control+Z was one of a
handful of keyboard sequences chosen by the program designers at Xerox
PARC to control text editing.

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