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Subject: bug#79857: hideshow: Unbalanced parentheses
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Some strange error occurs during font-lock in hs-minor-mode.
Reproducible test case:

0. emacs -Q
1. Eval:

(progn
  (setq backtrace-on-redisplay-error t)
  (setq hs-show-indicators t)
  (add-hook 'find-file-hook 'hs-minor-mode)
  (find-file (expand-file-name "lisp/frame.el" installation-directory))
  (search-forward "set-window-fringes")
  (reposition-window))

This shows:

⛔ Warning (error): Error in a redisplay Lisp hook.  See buffer *Redisplay-trace*

And the buffer *Redisplay-trace* contains:

Error: scan-error ("Unbalanced parentheses" 48293 48793)
  scan-sexps(48293 1)
  forward-sexp-default-function(1)
  forward-sexp(1)
  hs-forward-sexp((48293 48294 #<buffer frame.el>) 1)
  hs-block-positions()
  hs-hideable-region-p()
  hs-get-first-block()
  hs--add-indicators(48005 48793)
  jit-lock--run-functions(48005 48793)
  jit-lock-fontify-now(48005 48793)
  jit-lock-function(48005)
  repos-count-screen-lines(1 48793)
  reposition-window()

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To: Juri Linkov <juri@HIDDEN>
Subject: bug#79857: Acknowledgement (hideshow: Unbalanced parentheses)
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Date: Tue, 18 Nov 2025 17:07:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#79857: hideshow: Unbalanced parentheses
Resent-From: Elijah Gabe =?UTF-8?Q?P=C3=A9rez?= <eg642616@HIDDEN>
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Date: Tue, 18 Nov 2025 12:55:59 -0600
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Juri Linkov <juri@HIDDEN> writes:

> Some strange error occurs during font-lock in hs-minor-mode.
> Reproducible test case:
>
> 0. emacs -Q
> 1. Eval:
>
> (progn
>   (setq backtrace-on-redisplay-error t)
>   (setq hs-show-indicators t)
>   (add-hook 'find-file-hook 'hs-minor-mode)
>   (find-file (expand-file-name "lisp/frame.el" installation-directory))
>   (search-forward "set-window-fringes")
>   (reposition-window))
>
> This shows:
>
> =E2=9B=94 Warning (error): Error in a redisplay Lisp hook.  See buffer *R=
edisplay-trace*
>
> And the buffer *Redisplay-trace* contains:
>
> Error: scan-error ("Unbalanced parentheses" 48293 48793)
>   scan-sexps(48293 1)
>   forward-sexp-default-function(1)
>   forward-sexp(1)
>   hs-forward-sexp((48293 48294 #<buffer frame.el>) 1)
>   hs-block-positions()
>   hs-hideable-region-p()
>   hs-get-first-block()
>   hs--add-indicators(48005 48793)
>   jit-lock--run-functions(48005 48793)
>   jit-lock-fontify-now(48005 48793)
>   jit-lock-function(48005)
>   repos-count-screen-lines(1 48793)
>   reposition-window()

Yes, I forgot that forward-sexp can fail.

I fixed it and an bug that made `hs-hide-level-recursive` infloop.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-hideshow-Fix-regressions.-Bug-79857.patch

From 39323cec7d979aad09e517a30e3deb7b25e40109 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?El=C3=ADas=20Gabriel=20P=C3=A9rez?= <eg642616@HIDDEN>
Date: Tue, 18 Nov 2025 11:02:24 -0600
Subject: [PATCH] hideshow: Fix regressions.  (Bug#79857)

* lisp/progmodes/hideshow.el (hs-block-positions): Exit the
function if 'hs-forward-sexp' fails.
(hs-hide-level-recursive): Fix infloop.
* test/lisp/progmodes/hideshow-tests.el (hideshow-hide-level-1):
(hideshow-hide-level-2): Update tests.
---
 lisp/progmodes/hideshow.el            | 66 +++++++++++++++------------
 test/lisp/progmodes/hideshow-tests.el |  8 ++++
 2 files changed, 45 insertions(+), 29 deletions(-)

diff --git a/lisp/progmodes/hideshow.el b/lisp/progmodes/hideshow.el
index 62bbbe40164..a738f51bdaa 100644
--- a/lisp/progmodes/hideshow.el
+++ b/lisp/progmodes/hideshow.el
@@ -794,34 +794,39 @@ hs-block-positions
 This returns a list with the current code block beginning and end
 positions.  This does nothing if there is not a code block at current
 point."
-  (save-match-data
-    (save-excursion
-      (when (funcall hs-looking-at-block-start-predicate)
-        (let ((mdata (match-data t))
-              (header-end (match-end 0))
-              block-beg block-end)
-          ;; `block-start' is the point at the end of the block
-          ;; beginning, which may need to be adjusted
-          (save-excursion
-            (when hs-adjust-block-beginning-function
-              (goto-char (funcall hs-adjust-block-beginning-function header-end)))
-            (setq block-beg (line-end-position)))
-          ;; `block-end' is the point at the end of the block
-          (hs-forward-sexp mdata 1)
-          (setq block-end
-                (cond ((and (stringp hs-block-end-regexp)
-                            (looking-back hs-block-end-regexp nil))
-                       (match-beginning 0))
-                      ((functionp hs-block-end-regexp)
-                       (funcall hs-block-end-regexp)
-                       (match-beginning 0))
-                      (t (point))))
-          ;; adjust block end (if needed)
-          (when hs-adjust-block-end-function
+  ;; `catch' is used here if the search fails due unbalanced parentheses
+  ;; or any other unknown error caused in `hs-forward-sexp'.
+  (catch 'hs-sexp-error
+    (save-match-data
+      (save-excursion
+        (when (funcall hs-looking-at-block-start-predicate)
+          (let ((mdata (match-data t))
+                (header-end (match-end 0))
+                block-beg block-end)
+            ;; `block-start' is the point at the end of the block
+            ;; beginning, which may need to be adjusted
+            (save-excursion
+              (when hs-adjust-block-beginning-function
+                (goto-char (funcall hs-adjust-block-beginning-function header-end)))
+              (setq block-beg (line-end-position)))
+            ;; `block-end' is the point at the end of the block
+            (condition-case-unless-debug _
+                (hs-forward-sexp mdata 1)
+              (scan-error (throw 'hs-sexp-error nil)))
             (setq block-end
-                  (or (funcall hs-adjust-block-end-function block-beg)
-                      block-end)))
-          (list block-beg block-end))))))
+                  (cond ((and (stringp hs-block-end-regexp)
+                              (looking-back hs-block-end-regexp nil))
+                         (match-beginning 0))
+                        ((functionp hs-block-end-regexp)
+                         (funcall hs-block-end-regexp)
+                         (match-beginning 0))
+                        (t (point))))
+            ;; adjust block end (if needed)
+            (when hs-adjust-block-end-function
+              (setq block-end
+                    (or (funcall hs-adjust-block-end-function block-beg)
+                        block-end)))
+            (list block-beg block-end)))))))
 
 (defun hs--make-indicators-overlays (beg)
   "Helper function to make the indicators overlays."
@@ -1177,8 +1182,11 @@ hs-hide-level-recursive
 	    (not (nth 8 (syntax-ppss)))) ; not inside comments or strings
       (if (> arg 1)
 	  (hs-hide-level-recursive (1- arg) minp maxp)
-	(goto-char (match-beginning hs-block-start-mdata-select))
-	(hs-hide-block-at-point t))))
+        ;; `hs-hide-block-at-point' already moves the cursor, but if it
+        ;; fails, return to the previous position where we were.
+	(unless (and (goto-char (match-beginning hs-block-start-mdata-select))
+	             (hs-hide-block-at-point t))
+            (goto-char (match-end hs-block-start-mdata-select))))))
   (goto-char maxp))
 
 (defmacro hs-life-goes-on (&rest body)
diff --git a/test/lisp/progmodes/hideshow-tests.el b/test/lisp/progmodes/hideshow-tests.el
index a6b3ecfbd3d..9cf60c1ec84 100644
--- a/test/lisp/progmodes/hideshow-tests.el
+++ b/test/lisp/progmodes/hideshow-tests.el
@@ -254,6 +254,8 @@ hideshow-hide-level-1
    Comments
 */
 
+\"String\"
+
 int
 main(int argc, char **argv)
 {
@@ -270,6 +272,8 @@ hideshow-hide-level-1
    Comments
 */
 
+\"String\"
+
 int
 main(int argc, char **argv)
 {}
@@ -284,6 +288,8 @@ hideshow-hide-level-2
    Comments
 */
 
+\"String\"
+
 int
 main(int argc, char **argv)
 {
@@ -300,6 +306,8 @@ hideshow-hide-level-2
    Comments
 */
 
+\"String\"
+
 int
 main(int argc, char **argv)
 {
-- 
2.51.1


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Subject: bug#79857: hideshow: Unbalanced parentheses
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> +            (condition-case-unless-debug _

I always run Emacs with with debug-on-error,
so this condition-case-unless-debug still fails,
but condition-case fixed this problem.

I wonder why Emacs source has so many occurrences of
condition-case-unless-debug?  There are so many problems with it.

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close 79857 31.0.50
thanks

> I fixed it and an bug that made `hs-hide-level-recursive` infloop.

Thanks for the patch, I pushed it with 'condition-case'
instead of 'condition-case-unless-debug'.

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From: Juri Linkov <juri@HIDDEN>
To: Elijah Gabe =?iso-8859-1?Q?P=E9rez?= <eg642616@HIDDEN>
Subject: Re: bug#79857: hideshow: Unbalanced parentheses
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Date: Wed, 19 Nov 2025 09:20:27 +0200
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close 79857 31.0.50
thanks

> I fixed it and an bug that made `hs-hide-level-recursive` infloop.

Thanks for the patch, I pushed it with 'condition-case'
instead of 'condition-case-unless-debug'.

Last modified: Wed, 19 Nov 2025 07:30:03 UTC

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