magit-section-cycle-diffs: Deal with mapcan using nconc

Closes #5319.
magit · Feb 19, 2025 · 2b2d434 · 2b2d434
1 parent 2b3f2cb
commit 2b2d434
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lisp/magit-diff.el b/lisp/magit-diff.el
@@ -1999,7 +1999,7 @@ commit or stash at point, then prompt for a commit."
         (dolist (s sections)
           (magit-section-show s)
           (magit-section-hide-children s))
-      (let ((children (mapcan (##oref % children) sections)))
+      (let ((children (mapcan (##copy-sequence (oref % children)) sections)))
         (cond ((and (seq-some (##oref % hidden)   children)
                     (seq-some (##oref % children) children))
                (mapc #'magit-section-show-headings sections))