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PSPP-BUG: [bug #24801] No undo function

From: John Darrington
Subject: PSPP-BUG: [bug #24801] No undo function
Date: Mon, 10 Nov 2008 22:12:21 +0000
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20070505 Iceape/1.0.9 (Debian-1.0.13~pre080323b-0etch3)

Follow-up Comment #3, bug #24801 (project pspp):

> The cost, at most, would be doubling the memory and disk requirements (for
a single level of undo).

The single level qualification is of course pertinent.  I was thinking of
allowing multiple levels.

As I recall, what spss does (did) was to allow multiple levels of undo, until
an EXECUTE happens, at which point the stack is emptied and one cannot undo


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