peter sikking wrote:
> David Hodson wrote:
>> That's true, but how does that make undo different from many other
>> functions?
> undo involves user having a change of heart.
> a script cannot have a change of heart.
No but it can have a conditional execution path dependant on the result 
of a previous command.

resize image
save test.png
if (size of file) > 4GB undo resize.

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