GNU bug report logs - #69404
Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Gabriele Nicolardi <gabriele <at> medialab.sissa.it>
Subject: bug#69404: closed (Re: bug#69404: Loss of latex-mode
 fontification when loading libraries in latex-mode-hook that require
 json-mode)
Date: Wed, 28 Feb 2024 13:43:02 +0000

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Your bug report

#69404: Loss of latex-mode fontification when loading libraries in latex-mode-hook that require json-mode

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 69404 <at> debbugs.gnu.org.

-- 
69404: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=69404
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Gabriele Nicolardi <gabriele <at> medialab.sissa.it>
Cc: 69404-done <at> debbugs.gnu.org
Subject: Re: bug#69404: Loss of latex-mode fontification when loading
 libraries in latex-mode-hook that require json-mode
Date: Wed, 28 Feb 2024 15:41:24 +0200

> Date: Wed, 28 Feb 2024 14:29:40 +0100
> Cc: 69404 <at> debbugs.gnu.org
> From: Gabriele Nicolardi <gabriele <at> medialab.sissa.it>
> 
> Indeed it was a bug in json-mode.el
> 
> https://github.com/json-emacs/json-mode/issues/79

Thanks for telling us, I'm therefore closing this bug.

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From: Gabriele Nicolardi <gabriele <at> medialab.sissa.it>
To: bug-gnu-emacs <at> gnu.org
Subject: Loss of latex-mode fontification when loading libraries in
 latex-mode-hook that require json-mode
Date: Mon, 26 Feb 2024 10:27:53 +0100

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Hi,

my actual scenario involves using |latex-mode-hook| to load some 
libraries that require |json-mode|.

I replicated my issue in a MWE:

I have a |LaTeX| file:

|\documentclass{article} \usepackage{mwe} \begin{document} \blindtext 
\noindent \includegraphics[width=.4\textwidth]{example-image-a}\hfill 
\includegraphics[width=.4\textwidth]{example-image-b} \blindtext 
\end{document} |

If I load it like this:

|emacs -Q test.tex |

I get this “correct” |latex-mode| fontification:

enter image description here <https://i.stack.imgur.com/J2nvW.png>

I have also a config file (I simplified it to obtain the feature):

|(add-hook 'latex-mode-hook #'(lambda () (package-initialize) (require 
'json-mode))) |

If I load my |.tex| file like this:

|emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex |

I lose |latex-mode| fontification:

enter image description here <https://i.stack.imgur.com/pCKy8.png>

1. In the last case, to restore correct |latex-mode| fontification I
   need to do |M-x latex-mode|
2. This problem does not happen with other packages or custom libraries
   but, in my experience, it happens only for the |json-mode| package.
3. If I load |json-mode| “before” |latex-mode| I have no problem. E.g.
   if I modify the |config.el| file this way:

|(package-initialize) (require 'json-mode) |

and I do:

|emacs -Q --eval "(load-file \"/tmp/config.el\")" test.tex |

I get the correct |latex-mode| fontification.

Am I doing something wrong or is it some kind of bug in |json-mode| or 
in |Emacs|?

*Important note.* This didn’t happen with previous versions of |Emacs|. 
Before upgrading to version 29.2, I was using version 27 and never 
encountered this issue prior to the upgrade.

(I opened an issue on StackExchange where you can find the formatted 
version, with figures, of this message: 
https://emacs.stackexchange.com/q/80447/15606)

Best regards,

Gabriele Nicolardi

​

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