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

[Glenn Morris]

Glenn Morris wrote:

> Seems to have nothing to do with Mail mode. Minimal example with current
> trunk:
>
> emacs -Q
> 1
> C-x u
>     ; buffer still marked modified
>
>
> Issue not present in 24.3.

Bisected to:

revno: 111447
author: Aaron S. Hawley <aaron.s.hawley@gmail.com>
committer: Stefan Monnier <monnier@iro.umontreal.ca>
branch nick: trunk
timestamp: Tue 2013-01-08 14:13:31 -0500
message:
  * lisp/simple.el (primitive-undo): Move from undo.c.
  * src/undo.c (Fprimitive_undo): Move to simple.el.
  (syms_of_undo): Remove declaration for Sprimitive_undo.
  * test/automated/undo-tests.el: New file.