Follow-up Comment #2, bug #64233 (group groff):
commit c7f4885869b2db096f78bd30e685253cdc4b3891
Author: G. Branden Robinson <g.branden.robin...@gmail.com>
Date: Mon Sep 2 01:58:36 2024 -0500
[troff]: `kern` req now works like `color` et al.
The `kern` request now interprets arguments with negative values as
instructions to disable the corresponding feature, using the *roff
integer-to-Boolean conversion idiom instead of the C/C++ one. Thus, if
you invoke this request with a register interpolation, the outcome
agrees with an `if` test of the register's value.
* src/roff/troff/node.cpp: Demote type of global `global_kern_mode` from
`int` to `bool`.
(set_kerning_mode): Assign value to `global_kern_mode` using *roff
integer-to-Boolean conversion idiom. When no argument is present,
assign using Boolean, not integer, literal.
(init_node_requests): Back `.kern` register with an object of class
`readonly_boolean_register` instead of `readonly_register`.
* doc/groff.texi.in (Ligatures and Kerning):
* man/groff.7.man (Request short reference):
* man/groff_diff.7.man (New requests):
* NEWS: Document it.
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