[bug #44715] groff_font(5): Document lack of kerning for different styles

[G. Branden Robinson]

Follow-up Comment #3, bug #44715 (project groff):

Here's the text of the original report.  Neither Bjarni's chosen file name nor
Savannah's (lack of) file type identification on the attachment were as
helpful as they could have been.


                           Groff Bug Report

GROFF VERSION:
1.22.3 (Debian 1.22.3-1)

INPUT FILES:

\f[B]groff\f[P]'s
.br
groff's


COMMAND LINE:

groff -b -ww -Z -- <file>

DESCRIPTION OF INCORRECT BEHAVIOUR OR FAULTY INPUT (SOURCE):

  There is no kerning between characters of different styles

  Output:

x T ps
x res 72000 1 1
x init
p1
x font 38 TB
f38
s10000
V12000
H72000
md
DFd
tgr
H81260
toff
x font 5 TR
f5
t'
H95700
ts
n12000 0
V24000
H72000
tgrof
H88410
tf
h550
t'
H95070
ts
n12000 0
x trailer
V792000
x stop


SUGGESTED FIX [optional]:

  Document this in the manpage "groff_font(5)", (make a new) section
"kernpairing".  Mention a solution with for example '\^' and the \h'N'
request (for negative kerning).

  Point out the Heirloom implementation (heirloom.sourceforce.net) for
people that need (want) this capability (and other implementations that
have it).


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