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Re: [PATCH] Remove obsolete fast-lock and lazy-lock libraries

From: Stefan Monnier
Subject: Re: [PATCH] Remove obsolete fast-lock and lazy-lock libraries
Date: Mon, 10 Aug 2020 18:25:54 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

> OK, but why does that mean we should demote it from being a defcustom?

`defcustom` is mostly useful in order to set it globally in your config file.

> People who need to debug font-lock are also users, and being unable to
> change the value through "M-x set-variable" is an annoyance, at least
> for me.

`set-variable` works rather poorly here because it has no immediate
effect on the current buffer (until you re-enable font-lock).

That's why I'm suggesting a `font-lock-debug-mode` instead.

> Do you see any harm in keeping it as a defcustom?

If we add `font-lock-debug-mode` I don't see any benefit in keeping it.
The harm is limited to accumulating cruft.


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