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bug#14274: 24.3; disable undo for *Buffer List*

From: Stefan Monnier
Subject: bug#14274: 24.3; disable undo for *Buffer List*
Date: Fri, 26 Apr 2013 10:49:46 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> After my Emacs has been running for a while, I get warnings like this:
> ----
> Warning (undo): Buffer `*Buffer List*' undo info was 12075571 bytes long.
> The undo info was discarded because it exceeded `undo-outer-limit'.

Indeed, this buffer is updated as side-effect of various commands that
happen in other buffers, so we fail to regularly call undo-boundary
(which is automatically called at the end of each command, but only in
the currently selected buffer).

Disabling undo sounds like a good fix.  I even applied it to the parent
major mode so it will also apply to process-list and a few more.


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