Adjust width for fonts that Xft thinks are too wide

Fonts such as "Iosevka Fixed" exhibit the problem.

These links refer to the same problem with Inconsolata v3.000.
https://bugzilla.redhat.com/show_bug.cgi?id=1786054
googlefonts/Inconsolata#42
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=39082
https://lists.gnu.org/archive/html/bug-gnu-emacs/2020-01/msg00509.html
https://ask.csdn.net/questions/6153188

x.c

@@ -922,6 +922,8 @@ xloadfont(Font *f, FcPattern *pattern)
 
 	f->height = f->ascent + f->descent;
 	f->width = DIVCEIL(extents.xOff, strlen(ascii_printable));
+	if (extents.xOff > extents.width)
+		f->width -= extents.xOff - extents.width;
 
 	return 0;
 }