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

From	Dave <INVALID.NOREPLY@gnu.org>
Newsgroups	gnu.groff.bug
Subject	[bug #57448] groff will not break a line at a hard hyphen following some letter combinations
Date	2019-12-23 07:50 -0500
Message-ID	<mailman.1305.1577105443.1979.bug-groff@gnu.org> (permalink)
References	(1 earlier) <20191219-231340.sv93188.76941@savannah.gnu.org> <20191219-220856.sv93119.28405@savannah.gnu.org> <20191220-043627.sv93119.51933@savannah.gnu.org> <20191222-233745.sv93188.73578@savannah.gnu.org> <20191223-065039.sv93119.93277@savannah.gnu.org>

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Follow-up Comment #5, bug #57448 (project groff):

>   If the kerning in front of the hyphen is removed (with '\&'),
> the expected result is there.

Well, not if the expected result is for kerning and line-breaking to
simultaneously work. :)

If one needs a workaround, a better one is to add a zero-width breakpoint (\:)
after the hyphen.

But the greater trick is figuring out all the places such a \: is needed.  In
groff's default font set -- with relatively few kern pairs that have a hyphen
as the second character -- the problem is limited in scope.  But for installed
fonts with a larger set of kern pairs, the bug could crop up in unexpected
places.  (And there is nothing magical about two characters: any number of
kerned characters before a hyphen triggers the bug.)

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[bug #57448] groff will not break a line at a hard hyphen following some letter combinations Dave <INVALID.NOREPLY@gnu.org> - 2019-12-23 07:50 -0500

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