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bug#14824: 24.3.50; Regression: problem with undo in Mail mode

From: Aaron S. Hawley
Subject: bug#14824: 24.3.50; Regression: problem with undo in Mail mode
Date: Tue, 9 Jul 2013 10:20:48 -0400

> A shot in the dark: it might be due to the finer timestamps (since
> these were introduced fairly recently, whereas Aaron's code is actually
> pretty old (even tho it was installed only recently)).

That is a good theory.  I remember studying the time precision changes
by Paul Eggert from last year.  I think these were them:


The changes to time values in Emacs were a concern of mine when the
new Lisp version of undo was finally merged to trunk.  I don't have an
Emacs trunk build at the moment, so I can't confirm.  It would be this
section of the new undo code, though:


I am a little surprised this was broken in trunk for the last 6
months, and nobody had noticed.  The automated test suite could catch
this by adding a line containing (should (not (buffer-modified-p))) to
one of the unit tests.

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