Make default char of OS/2 be space for otf and .notdef for ttf. This is a guess at what should be done.

George Williams · George Williams · commit 224315aa8c49 · 2012-08-14T13:47:31.000+02:00
diff --git a/fontforge/stamp.c b/fontforge/stamp.c
@@ -1,5 +1,5 @@
 #include <time.h>
 
-const time_t source_modtime = 1166139502;
-const char *source_modtime_str = "15:38 14-Dec-2006";
+const time_t source_modtime = 1166145431;
+const char *source_modtime_str = "17:17 14-Dec-2006";
 const char *source_version_str = "20061214";
diff --git a/fontforge/tottf.c b/fontforge/tottf.c
@@ -3239,7 +3239,9 @@ docs are wrong.
 	QuickBlues(sf,&bd);		/* This handles cid fonts properly */
 	os2->xHeight = (bd.xheight >= 0.0 ? bd.xheight : 0);
 	os2->capHeight = (bd.caph >= 0.0 ? bd.caph : 0);
-	os2->defChar = ' ';
+	os2->defChar = 0;
+	if ( format==ff_otf || format==ff_otfcid )
+	    os2->defChar = ' ';
 	os2->breakChar = ' ';
 	os2->maxContext = 1;	/* Kerning will set this to 2, ligature to whatever */
     }
