Follow-up Comment #1, bug #57506 (project groff):
This bug dates to at least groff 1.02: commit 351da0dc, the oldest available
in git, shows that both of these files (then in directory ps/devps) had the
same slant values then that they have today.
$ git show 351da0dc:ps/devps/TI | grep ^slant
slant 7
$ git show 351da0dc:ps/devps/TBI | grep ^slant
slant 15
But these files, while they are groff source files (in that they live in the
groff source-code repository), do not appear to be actual source files, in
that they are built by font/devps/generate/Makefile (today, or
ps/devps/FontMakefile back in commit 351da0dc). Thus this bug may be in the
source files that TI and TBI are built from, or in the tools used to build
them.
The primary tool is the afmtodit Perl script, which is part of groff
(src/utils/afmtodit/afmtodit.pl, or ps/devps/afmtodit back in 351da0dc).
I am not sure of the origin of the primary source files, Times-Italic.afm and
Times-BoldItalic.afm. They don't live in the groff source tree (if they did,
presumably TI and TBI would not, instead being built by the groff build
process) or anywhere on my system. The Makefile expects them to be in
/usr/local/lib/afm.
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