Re: cc-mode fontification feels random

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Daniel Colascione <dancol@dancol.org>,  emacs-devel@gnu.org
> Date: Sun, 06 Jun 2021 13:44:06 -0400
> 
> > Because of the order various jit-lock chunks are fontified.  If the
> > chunk which establishes foo as a type is fontified first, subsequent
> > fontifications of foo will use font-lock-type-face.  Otherwise, not.
> 
> The way this is handled in other modes is to keep a highwater mark of
> the buffer position up to which the text has been scanned for type
> definitions and then in the font-lock-keywords you start by scanning the
> text between this mark and the text that needs to be fontified (and
> then moving the mark, of course).

So if the first windowful of a file that's displayed is at EOB,
fontification must go all the way back to BOB and start scanning
there, until it comes to the end?

> Indeed, there's no way currently for font-lock to tell jit-lock that it
> has decided to fontify a particular chunk without being requested to do
> so (Eli suggests setting the `fontified` property, but this means that
> all the clients of jit-lock have done their work, so it's only correct
> to set it from font-lock if you run the other `jit-lock-functions` (or
> if there are currently no other `jit-lock-functions`)),

By "other clients" you mean those which don't fontify, but instead
piggy-back jit-lock to do other jobs?