[bug #57448] groff will not break a line at a hard hyphen following some letter combinations

[Dave]

Follow-up Comment #6, bug #57448 (project groff):

And it turns out that kern pairs need not even exist between every letter of a
hyphen-containing phrase to trigger the bug.  For instance, the string
"major-Y-axis" has only two kern pairs in the Times typeface: between "r" and
"-", and "Y" and "-".  Yet groff will break at neither hyphen:


seq -w 0 99 | xargs -I FRACTION printf '.br\n.ll 3.FRACTIONc\nIt can show the
major-Y-axis line\n' | groff -a | fgrep It | uniq


The problem disappears if the Y is turned into an X.

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