Hi Berthold, thanks for the report.

>>>>> Berthold Lorke <berth...@lorke.de> writes:
> Okay, I am sorry if I am bugging you (no pun intended), but I now
> still do believe there is a problem.

> I am using auctex 13.1.9.  Let us assume the following inside of a
> buffer in `tex-mode` with auctex installed.  I did this with a fresh
> Emacs, no other packages installed and no config.

I assume AUCTeX latex mode, not `tex-mode`.

> - Mark the region where I wrote `a^2 + b^2 = c^2`, that is line 7.
> - Perform `M-x LaTeX-environment`, put `equation` in the prompt, press
>   enter, and then for the next prompt press enter again.

[...]

> As you can see, it is not correctly indented.  Have tried this
> multiple times on multiple machines and so on.  Can you confirm this
> behaviour?

Indeed. This is't nice. :-(

Currenty, `LaTeX-insert-environment' doesn't indent the active region if
the environment is in `LaTeX-indent-environment-list'. I expect that it
doesn't harm if it indents. Could you try the attached patch?

Bye,
Ikumi Keita
#StandWithUkraine #StopWarInUkraine

diff --git a/latex.el b/latex.el
index 56992d54..85d83f38 100644
--- a/latex.el
+++ b/latex.el
@@ -821,12 +821,12 @@ environment just inserted, the buffer position just before
     (end-of-line 0)
     (if active-mark
         (progn
-          (or (assoc environment LaTeX-indent-environment-list)
-              (if auto-fill-function
-                  ;; Fill the region only when `auto-fill-mode' is active.
-                  (LaTeX-fill-region content-start (line-beginning-position 2))
-                ;; Else just indent the region. (bug#48518)
-                (indent-region content-start (line-beginning-position 2))))
+	  (if (and auto-fill-function
+		   (not (assoc environment LaTeX-indent-environment-list)))
+              ;; Fill the region only when `auto-fill-mode' is active.
+              (LaTeX-fill-region content-start (line-beginning-position 2))
+            ;; Else just indent the region. (bug#48518)
+            (indent-region content-start (line-beginning-position 2)))
           (set-mark content-start))
       (indent-according-to-mode))
     ;; Indent \end{foo}.
@@ -1335,7 +1335,6 @@ Just like array and tabular."
     (LaTeX-newline)
     (indent-according-to-mode))
   (when (TeX-active-mark)
-    (indent-region (point) (mark))
     ;; Restore the positions of point and mark.
     (exchange-point-and-mark)))
 
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