bug#22658: 25.1.50; `undo-auto--boundary-timer` -- is it necessary to put this on a the `timer-list'?

[Eli Zaretskii]

> Date: Sun, 14 Feb 2016 00:04:43 -0800
> From: Keith David Bershatsky <esq@lawlist.com>
> 
> I'm not sure when it came about, but there is a `undo-auto--boundary-timer` 
> on a constant timer that didn't use to be there in previous versions of 
> Emacs.  It affected my ability to work on some redisplay debugging, and there 
> is no "convenient" way to just turn it off.
> 
> Inasmuch as Undo/Redo is such an important part of an editor, is there a way 
> to bake this important feature into the C-source code so that it doesn't 
> clutter up the timers and/or unnecessarily trigger a redisplay?

You can always remove the timer from timer-list, can't you?  In Emacs
25.1.50, there's even a command to do that.