From c95a34c96013aaba1cdf2166c4a1d0e2c5f3de6a Mon Sep 17 00:00:00 2001
From: YAMAMOTO Mitsuharu <mituharu@math.s.chiba-u.ac.jp>
Date: Sat, 30 Jul 2022 17:21:54 +0900
Subject: * src/macfont.m (macfont_open): Initialize font->space_width. 
 (Bug#56808)

---
 src/macfont.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/macfont.m b/src/macfont.m
index e3dab1c42e0..b30c3c9763c 100644
--- a/src/macfont.m
+++ b/src/macfont.m
@@ -2628,6 +2628,9 @@ macfont_open (struct frame * f, Lisp_Object entity, int pixel_size)
   font->pixel_size = size;
   font->driver = &macfont_driver;
   font->encoding_charset = font->repertory_charset = -1;
+  /* Clear font->space_width so macfont_monospace_width_multiplier may
+     not be confused by an uninitialized value.  */
+  font->space_width = 0;
 
   block_input ();
 
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