Fix assertion violation with zero-width :box attributes

* src/xfaces.c (merge_face_ref): Don't allow :box attribute with a
zero value.  (Bug#50699)

diff --git a/src/xfaces.c b/src/xfaces.c
index aefed54ebcb6edaae0811d7271bcc1ef6698762b..c5b7a568aeb05aee75272041d35fe2c29cc36297 100644 (file)
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -2709,7 +2709,7 @@ merge_face_ref (struct window *w,
                {
                  if (EQ (value, Qt))
                    value = make_fixnum (1);
-                 if (FIXNUMP (value)
+                 if ((FIXNUMP (value) && XFIXNUM (value) != 0)
                      || STRINGP (value)
                      || CONSP (value)
                      || NILP (value))