Works fine. Tested also in one of my projects

Il giorno mer 14 gen 2026 alle 13:33:34 +01:00:00, Arash Esbati <[email protected]> ha scritto:
Arash Esbati <[email protected] <mailto:[email protected]>> writes:

I think we're not done yet. The file sent by Domenico runs lualatex and not pdflatex. When running lualatex on the file in a shell like this:

   lualatex --jobname=longtable-bug -file-line-error \
     -interaction=nonstopmode longtable-bug.tex

 It emits

./longtable-bug.tex:117: Infinite glue shrinkage found in box being split

 So the 'ignored error' part is missing.

   pdflatex --jobname=longtable-bug -file-line-error \
     -interaction=nonstopmode longtable-bug.tex

./longtable-bug.tex:117: ignored error: Infinite glue shrinkage found in box being split

Domenico, can you please install the patch below on top your current
AUCTeX installation, byte-compile the file, restart Emacs and see if it
works?  I did some brief testing and it seems to work.

--8<---------------cut here---------------start------------->8---
diff --git a/tex.el b/tex.el
index c81f9554..c46f2594 100644
--- a/tex.el
+++ b/tex.el
@@ -8618,7 +8618,11 @@ Return nil only if no errors were found."
   (if process (TeX-format-mode-line process))
   (if (catch 'found
(while (and (re-search-forward "^\\(?:!\\|\\(.+?\\):[0-9]+:\\) " nil t)
-                    (not (looking-at-p "ignored error: ")))
+                    (not (looking-at-p
+                          (mapconcat #'identity
+                                     '("ignored error: "
+ "Infinite glue shrinkage found in box being split")
+                                     "\\|"))))
           (if (or (not (match-beginning 1))
                   ;; Ignore non-error warning. (bug#55065)
                   (file-exists-p (TeX-match-buffer 1)))
@@ -8642,10 +8646,10 @@ Return nil only if no errors were found."
     ;; bug#55065, restore point to the initial position.
     (goto-char (point-min))
     (let (dvi2pdf)
-        (if (with-current-buffer TeX-command-buffer
-           (and TeX-PDF-mode (setq dvi2pdf (TeX-PDF-from-DVI))))
-         (setq TeX-command-next dvi2pdf)
-       (setq TeX-command-next TeX-command-Show)))
+      (if (with-current-buffer TeX-command-buffer
+            (and TeX-PDF-mode (setq dvi2pdf (TeX-PDF-from-DVI))))
+          (setq TeX-command-next dvi2pdf)
+        (setq TeX-command-next TeX-command-Show)))
     nil))

 ;; This regexp should catch warnings of the type
--8<---------------cut here---------------end--------------->8---

TIA.  Best, Arash

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