Fix average font width calculation on NS.

* src/nsfont.m (nsfont_open): Similar to the Xft backend, set
min_width to space_width and average_width to the average over
printable ASCII characters.
(ns_char_width): Code cleanup.
(ns_ascii_average_width): New utility function.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/nsterm.h b/src/nsterm.h
index 94984b3d35e..54f4a4ec89e 100644
--- a/src/nsterm.h
+++ b/src/nsterm.h
@@ -450,7 +450,10 @@ struct nsfont_info
   struct font font;
 
   char *name;  /* PostScript name, uniquely identifies on NS systems */
-  float width;  /* this and following metrics stored as float rather than int */
+
+  /* The following metrics are stored as float rather than int. */
+
+  float width;  /* Maximum advance for the font.  */
   float height;
   float underpos;
   float underwidth;