mandoc: Digit-width and narrow spaces are non-breaking.

[schwarze@mandoc.bsd.lv]

Log Message:
-----------
Digit-width and narrow spaces are non-breaking.
Noticed because Branden Robinson worked on related documentation in groff.

Modified Files:
--------------
    mandoc:
        chars.c
        mandoc_char.7

Revision Data
-------------
Index: chars.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/chars.c,v
retrieving revision 1.78
retrieving revision 1.79
diff -Lchars.c -Lchars.c -u -p -r1.78 -r1.79
--- chars.c
+++ chars.c
@@ -1,7 +1,8 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2011,2014,2015,2017,2018 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2011, 2014, 2015, 2017, 2018, 2020
+ *               Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -47,7 +48,7 @@ static struct ln lines[] = {
 	/* Spacing. */
 	{ " ",			ascii_nbrsp,	0x00a0	},
 	{ "~",			ascii_nbrsp,	0x00a0	},
-	{ "0",			" ",		0x2002	},
+	{ "0",			ascii_nbrsp,	0x00a0	},
 	{ ":",			ascii_break,	0	},
 
 	/* Lines. */
Index: mandoc_char.7
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mandoc_char.7,v
retrieving revision 1.76
retrieving revision 1.77
diff -Lmandoc_char.7 -Lmandoc_char.7 -u -p -r1.76 -r1.77
--- mandoc_char.7
+++ mandoc_char.7
@@ -2,7 +2,7 @@
 .\"
 .\" Copyright (c) 2003 Jason McIntyre <jmc@openbsd.org>
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
-.\" Copyright (c) 2011,2013,2015,2017,2018 Ingo Schwarze <schwarze@openbsd.org>
+.\" Copyright (c) 2011,2013,2015,2017-2020 Ingo Schwarze <schwarze@openbsd.org>
 .\"
 .\" Permission to use, copy, modify, and distribute this software for any
 .\" purpose with or without fee is hereby granted, provided that the above
@@ -261,15 +261,15 @@ subsection of the
 .Xr roff 7
 manual.
 .Pp
-Spacing:
+Spaces, non-breaking unless stated otherwise:
 .Bl -column "Input" "Description" -offset indent -compact
 .It Em Input Ta Em Description
-.It Sq \e\ \& Ta unpaddable non-breaking space
-.It \e\(ti   Ta paddable non-breaking space
-.It \e0      Ta digit-width space allowing line break
+.It Sq \e\ \& Ta unpaddable space
+.It \e\(ti   Ta paddable space
+.It \e0      Ta digit-width space
 .It \e|      Ta one-sixth \e(em narrow space, zero width in nroff mode
 .It \e^      Ta one-twelfth \e(em half-narrow space, zero width in nroff
-.It \e&      Ta zero-width non-breaking space
+.It \e&      Ta zero-width space
 .It \e)      Ta zero-width space transparent to end-of-sentence detection
 .It \e%      Ta zero-width space allowing hyphenation
 .It \e:      Ta zero-width space allowing line break
--
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