Fix another case of freed markers in the undo-list (Bug#30931)

* src/alloc.c (free_marker): Remove.
* src/editfns.c (save_restriction_restore):
* src/insdel.c (signal_before_change): Detach the markers from the
buffer when we're done with them instead of calling free_marker on
them.
* test/src/editfns-tests.el (delete-region-undo-markers-1)
(delete-region-undo-markers-2): New tests.

1 files changed, 0 insertions, 1 deletions

diff --git a/src/lisp.h b/src/lisp.h
index b931d23bf38..f471b216587 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -3812,7 +3812,6 @@ extern Lisp_Object make_save_funcptr_ptr_obj (void (*) (void), void *,
 extern Lisp_Object make_save_memory (Lisp_Object *, ptrdiff_t);
 extern void free_save_value (Lisp_Object);
 extern Lisp_Object build_overlay (Lisp_Object, Lisp_Object, Lisp_Object);
-extern void free_marker (Lisp_Object);
 extern void free_cons (struct Lisp_Cons *);
 extern void init_alloc_once (void);
 extern void init_alloc (void);