From ef73f5c25430c43bd4e87aabcdb5e880d933d026 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?El=C3=ADas=20Gabriel=20P=C3=A9rez?= <eg642616@gmail.com>
Date: Wed, 10 Dec 2025 10:05:44 -0600
Subject: [PATCH] ; * lisp/progmodes/hideshow.el (hs-cycle): Fix regression.
 (Bug#79983)

* test/lisp/progmodes/hideshow-tests.el
(hideshow-cycle-with-delimiters)
(hideshow-cycle-without-delimiters)
(hideshow-check-unbalanced-parens): Add new tests.
---
 lisp/progmodes/hideshow.el            |  5 +-
 test/lisp/progmodes/hideshow-tests.el | 84 +++++++++++++++++++++++++++
 2 files changed, 87 insertions(+), 2 deletions(-)

diff --git a/lisp/progmodes/hideshow.el b/lisp/progmodes/hideshow.el
index f0bea28ceac..7f47f7588ff 100644
--- a/lisp/progmodes/hideshow.el
+++ b/lisp/progmodes/hideshow.el
@@ -1425,7 +1425,7 @@ only blocks which are that many levels below the level of point."
             (message "Hide %d level" level))
            (t
             (let* (hs-allow-nesting
-                   (block (hs-block-positions nil :ad-end))
+                   (block (hs-block-positions :ad-beg :ad-end))
                    (ov (seq-find
                         (lambda (o)
                           (and (eq (overlay-get o 'invisible) 'hs)))
@@ -1436,7 +1436,8 @@ only blocks which are that many levels below the level of point."
                 (hs-hide-block)
                 (message "Hide block and nested blocks"))
                ;; Hide the children blocks if the parent block is hidden
-               ((= (overlay-end ov) (cadr block))
+               ((and (= (overlay-start ov) (car block))
+                     (= (overlay-end ov) (cadr block)))
                 (apply #'hs-hide-level-recursive 1 block)
                 (message "Hide first nested blocks"))
                ;; Otherwise show all in the parent block, we cannot use
diff --git a/test/lisp/progmodes/hideshow-tests.el b/test/lisp/progmodes/hideshow-tests.el
index 39161f2455c..49f661a2390 100644
--- a/test/lisp/progmodes/hideshow-tests.el
+++ b/test/lisp/progmodes/hideshow-tests.el
@@ -342,6 +342,90 @@ main()
      (funcall call-at "}")
      (should (string= (hideshow-tests-visible-string) contents)))))
 
+(ert-deftest hideshow-cycle-with-delimiters ()
+  "Should cycle the visibility of a block with delimiters."
+  (let ((contents "
+int
+main ()
+{
+  {
+    {
+    }
+  }
+}
+"))
+    (hideshow-tests-with-temp-buffer
+     c-mode
+     contents
+     (hideshow-tests-look-at "{")
+     (hs-cycle 1)
+     (should (string=
+              (hideshow-tests-visible-string)
+              "
+int
+main ()
+{}
+"))
+     (hs-cycle 1)
+     (should (string=
+              (hideshow-tests-visible-string)
+              "
+int
+main ()
+{
+  {}
+}
+"))
+     (hs-cycle 1)
+     (should (string=
+              (hideshow-tests-visible-string)
+              contents)))))
+
+(ert-deftest hideshow-cycle-without-delimiters ()
+  "Should cycle the visibility of a block without delimiters."
+  (let ((contents "
+def test1 ():
+    def test2 ():
+        def test3():
+"))
+    (hideshow-tests-with-temp-buffer
+      python-mode
+      contents
+      (hideshow-tests-look-at "test1")
+      (hs-cycle 1)
+      (should (string=
+               (hideshow-tests-visible-string)
+               "
+def test1 ():
+"))
+      (hs-cycle 1)
+      (should (string=
+               (hideshow-tests-visible-string)
+               "
+def test1 ():
+    def test2 ():
+"))
+      (hs-cycle 1)
+      (should (string=
+               (hideshow-tests-visible-string)
+               contents)))))
+
+(ert-deftest hideshow-check-unbalanced-parens ()
+  (let ((contents "
+(defun test1 ())
+
+(defun test2
+"))
+    (hideshow-tests-with-temp-buffer
+     c-mode
+     contents
+     (hideshow-tests-look-at "test1")
+     (beginning-of-line)
+     (should (hs-block-positions))
+     (hideshow-tests-look-at "test2")
+     (beginning-of-line)
+     (should-not (hs-block-positions)))))
+
 (provide 'hideshow-tests)
 
 ;;; hideshow-tests.el ends here