From: Stefan Monnier <monnier@iro.umontreal.ca>
Date: Sat, 4 Mar 2023 00:13:03 +0000 (-0500)
Subject: * src/intervals.c (set_intervals_multibyte_1): Fix bug#61887
X-Git-Tag: emacs-29.0.90~256
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=adc04ad52474113e5a540b33fbefd389b861a89f;p=emacs.git

* src/intervals.c (set_intervals_multibyte_1): Fix bug#61887

When `total_length` is 0 there should be no subtree at all, but
`delete_interval` only deletes one interval, so make sure we don't end
up with some stale child of `i`.
---

diff --git a/src/intervals.c b/src/intervals.c
index 75e37a8c90c..ee976fb1035 100644
--- a/src/intervals.c
+++ b/src/intervals.c
@@ -2333,6 +2333,9 @@ set_intervals_multibyte_1 (INTERVAL i, bool multi_flag,
 
   if (TOTAL_LENGTH (i) == 0)
     {
+      /* Delete the whole subtree.  */
+      i->left = NULL;
+      i->right = NULL;
       delete_interval (i);
       return;
     }