Subject: 12.1.1; TeX Fold fontification problem

From: Marco Falconi <[email-masked]>
Date: Tue, 05 Jun 2018 10:45:21 +0200

I have a custom definition of math macros to be folded. It is the following (taken from
.emacs in the customize part, I have set it using customize):

'(LaTeX-fold-math-spec-list
   (quote
    (("[{1}/{2}]"
      ("frac" "tfrac"))
     ("[{1}⇣{2}]"
      ("underset"))
     ("[{1}⇡{2}]"
      ("overset"))
     ("︷[{1}]"
      ("underbrace"))
     ("√[{1}]"
      ("sqrt")))))

In the ones with two arguments (frac, tfrac, underset, overset), the first argument gets
fontified in the folded string, but the second one is not fontified (in the unfolded
string, everything is fontified correctly). This macro for example has such behavior:

\underset{\hslash\to 0}{ \longrightarrow}

The macros with just one argument are fontified correctly also when folded.

Emacs  : GNU Emacs 26.1 (build 1, x86_64-apple-darwin13.4.0, Carbon Version 157 AppKit 1265.21)
 of 2018-04-15
Package: 12.1.1

current state:
==============
(setq
 AUCTeX-date "2018-03-20"
 window-system 'mac
 LaTeX-version "2e"
 TeX-style-path '("/usr/local/var/auctex" "/Users/lobo/.emacs.d/elpa/auctex-12.1.1/style" "/Users/lobo/.emacs.d/auctex/auto"
		  "/Users/lobo/.emacs.d/auctex/style" "auto" "style")
 TeX-auto-save t
 TeX-parse-self t
 TeX-master nil
 TeX-command-list '(("TeX" "%(PDF)%(tex) %(file-line-error) %(extraopts) %`%S%(PDFout)%(mode)%' %t" TeX-run-TeX nil
		     (plain-tex-mode texinfo-mode ams-tex-mode) :help "Run plain TeX")
		    ("LaTeX" "%`%l%(mode)%' %t" TeX-run-TeX nil (latex-mode doctex-mode) :help "Run LaTeX")
		    ("Makeinfo" "makeinfo %(extraopts) %t" TeX-run-compile nil (texinfo-mode) :help "Run Makeinfo with Info output")
		    ("Makeinfo HTML" "makeinfo %(extraopts) --html %t" TeX-run-compile nil (texinfo-mode) :help "Run Makeinfo with HTML output")
		    ("AmSTeX" "amstex %(PDFout) %(extraopts) %`%S%(mode)%' %t" TeX-run-TeX nil (ams-tex-mode) :help "Run AMSTeX")
		    ("ConTeXt" "%(cntxcom) --once --texutil %(extraopts) %(execopts)%t" TeX-run-TeX nil (context-mode) :help "Run ConTeXt once")
		    ("ConTeXt Full" "%(cntxcom) %(extraopts) %(execopts)%t" TeX-run-TeX nil (context-mode) :help "Run ConTeXt until completion")
		    ("BibTeX" "bibtex %s" TeX-run-BibTeX nil t :help "Run BibTeX") ("Biber" "biber %s" TeX-run-Biber nil t :help "Run Biber")
		    ("View" "%V" TeX-run-discard-or-function t t :help "Run Viewer") ("Print" "%p" TeX-run-command t t :help "Print the file")
		    ("Queue" "%q" TeX-run-background nil t :help "View the printer queue" :visible TeX-queue-command)
		    ("File" "%(o?)dvips %d -o %f " TeX-run-dvips t t :help "Generate PostScript file")
		    ("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil t :help "Convert DVI file to PostScript")
		    ("Dvipdfmx" "dvipdfmx %d" TeX-run-dvipdfmx nil t :help "Convert DVI file to PDF with dvipdfmx")
		    ("Ps2pdf" "ps2pdf %f" TeX-run-ps2pdf nil t :help "Convert PostScript file to PDF")
		    ("Glossaries" "makeglossaries %s" TeX-run-command nil t :help "Run makeglossaries to create glossary file")
		    ("Index" "makeindex %s" TeX-run-index nil t :help "Run makeindex to create index file")
		    ("upMendex" "upmendex %s" TeX-run-index t t :help "Run upmendex to create index file")
		    ("Xindy" "texindy %s" TeX-run-command nil t :help "Run xindy to create index file")
		    ("Check" "lacheck %s" TeX-run-compile nil (latex-mode) :help "Check LaTeX file for correctness")
		    ("ChkTeX" "chktex -v6 %s" TeX-run-compile nil (latex-mode) :help "Check LaTeX file for common mistakes")
		    ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil t :help "Spell-check the document")
		    ("Clean" "TeX-clean" TeX-run-function nil t :help "Delete generated intermediate files")
		    ("Clean All" "(TeX-clean t)" TeX-run-function nil t :help "Delete generated intermediate and output files")
		    ("Other" "" TeX-run-command t t :help "Run an arbitrary command") ("Forward" "pdf-sync-forward-search" TeX-run-function nil t))
 )