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Re: Fontification error backtrace [Was: Why is it so difficult to get a


From: Eli Zaretskii
Subject: Re: Fontification error backtrace [Was: Why is it so difficult to get a Lisp backtrace?]
Date: Sat, 02 Jul 2022 08:53:00 +0300

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: acm@muc.de,  larsi@gnus.org,  emacs-devel@gnu.org
> Date: Fri, 01 Jul 2022 15:26:26 -0400
> 
> >> BTW, in order to debug fontification errors, we also have
> >> `jit-locak-debug-mode` which postpones the jit/font-lock execution from
> >> within redisplay to "just a bit later" such that it can use the
> >> debugger.  IIRC it still has some rough edges in some cases, but in
> >> theory it should be possible to make this work such that you can (for
> >> example) Edebug `font-lock.el` itself.
> >
> > It would be nice to have this documented in the ELisp manual.  I can
> > easily add the jit-lock-debug-mode variable there, but from what you
> > write, there seems to be more wisdom to go with its usage.
> 
> No, there's no extra wisdom.

Then what did you mean by "some rough edges in some cases"?



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