GNU bug report logs - #78752
31.0.50; New tex-mode prettify-symbols-mode rule causes visual regression

Previous Next

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Tony Zorman <mail <at> tony-zorman.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 31.0.50; New tex-mode prettify-symbols-mode rule causes visual
 regression
Date: Tue, 10 Jun 2025 18:39:37 +0200

Hi,

ever since ef6203b64aaf (Extend prettify-symbols-alist in TeX mode)
'tex--prettify-symbols-alist' contains the line

    ("\\ " . 9141) ; Literal ?⎵ breaks indentation

However, this is problematic and results in false positives for this
glyph, since it clashes with two literal backslashes -- which may be
used for line breaks -- followed by a space. For example,

    \begin{align*}
      f\colon A &\to B\\ a &\mapsto f(a) 
    \end{align*}

would display as

    \begin{align*}
      f: A &→ B\⎵a &↦ f(a) 
    \end{align*}

While I agree that a double backslash not followed by a newline is
confusing, some of my coauthors don't. This also affects other
environments that some people like to compress, like the ones for
matrices or TikZ pictures. I don't think getting this right is possible
without using regular expressions (which is AFAIU not how
'prettify-symbols-mode' works).

  Tony

-- 
Tony Zorman | https://tony-zorman.com

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.