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Undo customization for a function

From: weber
Subject: Undo customization for a function
Date: Wed, 16 Jul 2008 06:24:13 -0700 (PDT)
User-agent: G2/1.0

Hi folks.

Suppose a function F that is executed several times in a row.
Is there any way that I can customize undo behavior so that undoing
reverts all changes for sucessive calls?

Something like this:

state A
user calls `insert'
state B
user calls `F'
state C
user calls `F'
state D

and after this, calling undo reverts buffer to state B?

Thanks in advance,

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