Hi all,
To reproduce, put this in a LaTeX-mode buffer:
--8<---------------cut here---------------start------------->8---
% \begin{split}
% a &= b.
% \end{split}
--8<---------------cut here---------------end--------------->8---
Make sure LaTeX-syntactic-comments is set to t (the default).
There are two related issues:
1. Run indent-region on the second line. This inserts two spaces before
"%", when it shouldn't.
2. Then, run indent-region on the third line. This gives the error:
"Can’t locate beginning of current environment"
The issue is that LaTeX-indent-calculate uses the indent logic for
special environments even when computing the outer indentation for
comments (i.e., what comes before the "%"), where it shouldn't apply.
With the attached patch, it skips that logic in such cases.
Any feedback welcome. I'll install if there are no objections.
Thanks, best,
Paul
>From 036e8fa592e5e4bb3de7146bbf1838b9c3c829f1 Mon Sep 17 00:00:00 2001
From: Paul Nelson <[email protected]>
Date: Thu, 25 Jun 2026 14:45:36 +0200
Subject: [PATCH] Fix indentation of commented special environments
On a commented line, indentation for special environments should
apply only to the inner content. Otherwise, commented
environments such as 'split' are indented incorrectly.
* latex.el (LaTeX-indent-calculate): Skip special environment
indentation when computing the outer indentation of a commented
line.
* tests/latex/math-indent-in.tex:
* tests/latex/math-indent-out.tex: New test cases.
---
latex.el | 4 ++++
tests/latex/math-indent-in.tex | 10 ++++++++++
tests/latex/math-indent-out.tex | 10 ++++++++++
3 files changed, 24 insertions(+)
diff --git a/latex.el b/latex.el
index cc24b3e0..bbf74a3f 100644
--- a/latex.el
+++ b/latex.el
@@ -4553,6 +4553,10 @@ outer indentation in case of a commented line. The symbols
;; empty line appears in LaTeX's output.
0)
((and LaTeX-indent-environment-check
+ ;; Special indentation should apply only to the inner
+ ;; part of comments.
+ (not (and (eq force-type 'outer)
+ (TeX-in-commented-line)))
;; Special environments.
(let ((entry (assoc (or LaTeX-current-environment
(LaTeX-current-environment))
diff --git a/tests/latex/math-indent-in.tex b/tests/latex/math-indent-in.tex
index 16acac60..c1f9fd46 100644
--- a/tests/latex/math-indent-in.tex
+++ b/tests/latex/math-indent-in.tex
@@ -15,3 +15,13 @@ y &= z
x
\]
\end{itemize}
+
+% \begin{split}
+% a &= b.
+% \end{split}
+
+% \begin{equation*}
+% \begin{split}
+% a &= b.
+% \end{split}
+% \end{equation*}
diff --git a/tests/latex/math-indent-out.tex b/tests/latex/math-indent-out.tex
index e895be28..6996d43d 100644
--- a/tests/latex/math-indent-out.tex
+++ b/tests/latex/math-indent-out.tex
@@ -15,3 +15,13 @@
x
\]
\end{itemize}
+
+% \begin{split}
+% a &= b.
+% \end{split}
+
+% \begin{equation*}
+% \begin{split}
+% a &= b.
+% \end{split}
+% \end{equation*}
--
2.54.0
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