tag -1 + upstream fixed-upstream thanks A fix for this problem has been committed upstream and it is expected in the groff 1.23.0 release.
commit 6692653f7cae4116d4e70318f71b3d0808f2261f
Author: G. Branden Robinson <g.branden.robin...@gmail.com>
Date: Sat Sep 11 07:02:07 2021 +1000
[troff]: Clamp negative tab stop positions to 0.
...instead of throwing an assertion failure.
* src/roff/troff/env.cpp (tab_stops::distance_to_next_tab): Replace
`assert` with clamping logic, ensuring that `lastpos` can never be
negative. While negative tab stop positions don't make much sense
(they result in zero horizontal motion), user input like `.ta T -5`
should never provoke an assertion failure.
(set_tabs): Throw range warning in additional scenario, viz., if a
repeating tab offset is negative.
Fixes <https://bugs.debian.org/990406>. Thanks to наб for the report.
Also wrap nearby long source lines.
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