Re: [Emacs-diffs] master 19e09cf: Ensure redisplay after evaluation

[Noam Postavsky <npostavs@users.sourceforge.net>]

On Mon, Nov 9, 2015 at 2:17 PM, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: John Wiegley <jwiegley@gmail.com>
>> Cc: Stefan Monnier <monnier@iro.umontreal.ca>,  emacs-devel@gnu.org
>> Date: Mon, 09 Nov 2015 11:06:47 -0800
>>
>> Allowing dynamic behavior to trigger on modifying a variable could be very
>> valuable during debugging. GDB allows this in the form of watchpoints.
>>
>> As long as we never allow the use of this facility to creep into Emacs itself,
>> I can see value in giving users another way to debug and/or customize their
>> environment, as long as they are fully informed of the potential costs.
>
> I agree, but the problem is that now someone needs to re-implement
> that changeset from scratch, without looking too much at the patch
> posted back then.  I cannot be that someone, unfortunately.
>

This functionality sounds very useful; I have definitely wanted
something like this while debugging in the past.

Where should I look to get an idea of how to implement it?