Re: master 2399541: Remove font-lock toggle from font-lock-update

[Gregory Heytings]

Thanks for your detailed reply!

> Yes, there are three cases: - font-lock-mode is nil - font-lock-mode is 
> t but the font-lock machinery is not activated (e.g. in text-mode with 
> the default config). - font-lock fully activated.

With this indication and another mail you sent to Eli, I think I finally 
understand what you mean.  One thing I'm not entirely sure is whether the 
second case is (and font-lock-mode (not font-lock-keywords)) or (and 
font-lock-mode (not font-lock-fontified)), but my guess is that 
font-lock-fontified is an internal variable and that it is safer to use 
font-lock-keywords here.

> > +Otherwise, with prefix ARG, toggle Font Lock mode."
>
> Is this behavior useful?

I think it is, yes, and I think it makes sense to use the prefix argument 
for that.  M-x font-lock-mode does not always produce the expected effect, 
which can be puzzling, so having a way to "do what I mean" in a command is 
useful.

I attach the patch, updated with your suggestions.

0001-Improve-font-lock-update-and-rename-it-to-font-lock-.patch
Description: Text Data