(Finternal_set_lisp_face_attribute): If the font is to be updated,

clear its average width field too.

diff --git a/src/xfaces.c b/src/xfaces.c
index aa3041d6910c9dabe2e7463a999839a151d4cce6..196abe11dd7bcf961c8522053ec44e6962479870 100644 (file)
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -3356,12 +3356,16 @@ FRAME 0 means change the face on all frames, and change the default
     signal_error ("Invalid face attribute name", attr);
 
   if (prop_index)
-    /* If a font-related attribute other than QCfont and QCfontset is
-       specified, and if the original QCfont attribute has a font
-       (font-spec or font-object), set the corresponding property in
-       the font to nil so that the font selector doesn't think that
-       the attribute is mandatory.  */
-    font_clear_prop (XVECTOR (lface)->contents, prop_index);
+    {
+      /* If a font-related attribute other than QCfont and QCfontset
+        is specified, and if the original QCfont attribute has a font
+        (font-spec or font-object), set the corresponding property in
+        the font to nil so that the font selector doesn't think that
+        the attribute is mandatory.  Also, clear the average
+        width.  */
+      font_clear_prop (XVECTOR (lface)->contents, prop_index);
+      font_clear_prop (XVECTOR (lface)->contents, FONT_AVGWIDTH_INDEX);
+    }
 
   /* Changing a named face means that all realized faces depending on
      that face are invalid.  Since we cannot tell which realized faces