Quote: implement 'undo' with an undo transcript, redo transcript, and sequence numbers; e.g., global substitution in reverse order

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[Acme applies changes] directly to the file, with an undo … is added directly and a record of what … the file [sic.] are marked with a sequence … invariant state of the [undo] structure is that … applies to the current state of the file, … [For example, a global substitution is undone in reverse thus maintaining the addresses of pending changes.] … To undo an action, pop the last item … second, redo list. To redo an action, do …   Google-1   Google-2

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Topic: undoing actions in a UserInterface (23 items)