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The problem can be reproduced with the `test.tex' file attached below. When I tried to add more characters to the `align' environment in `test.tex', the syntax highlighting becomes extremely unstable, switching between math and plain text highlighting.
Best,
Ruiyang
Emacs : GNU Emacs 26.3 (build 1, x86_64-w64-mingw32)
of 2019-08-29
Package: 12.2.0
current state:
==============
(setq
AUCTeX-date "2019-10-31"
window-system 'w32
LaTeX-version "2e"
TeX-style-path '("~/.emacs.d/auctex" "c:/Users/ywwry/.emacs.d/elpa/auctex-12.2.0/style" "c:/Users/ywwry/.emacs.d/auctex/auto" "c:/Users/ywwry/.emacs.d/auctex/style" "auto" "style")
TeX-auto-save t
TeX-parse-self t
TeX-master t
TeX-command-list '(("TeX" "%(PDF)%(tex) %(file-line-error) %`%(extraopts) %S%(PDFout)%(mode)%' %t" TeX-run-TeX nil (plain-tex-mode ams-tex-mode texinfo-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 (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode context-mode) :help "Run BibTeX")
("Biber" "biber %s" TeX-run-Biber nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :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 (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Generate PostScript file")
("Dvips" "%(o?)dvips %d -o %f " TeX-run-dvips nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Convert DVI file to PostScript")
("Dvipdfmx" "dvipdfmx %d" TeX-run-dvipdfmx nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Convert DVI file to PDF with dvipdfmx")
("Ps2pdf" "ps2pdf %f" TeX-run-ps2pdf nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Convert PostScript file to PDF")
("Glossaries" "makeglossaries %s" TeX-run-command nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help
"Run makeglossaries to create glossary\n file")
("Index" "makeindex %s" TeX-run-index nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run makeindex to create index file")
("upMendex" "upmendex %s" TeX-run-index t (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :help "Run upmendex to create index file")
("Xindy" "texindy %s" TeX-run-command nil (plain-tex-mode latex-mode doctex-mode ams-tex-mode texinfo-mode) :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"))
)
--
Ruiyang Wu
Graduate Student
Department of Mathematics
University of Arizona
Tucson, AZ, 85721 USA
test.tex