bugGNU roff - Bugs: bug #63360, kern U+2011 (nonbreaking hyphen)...


bug #63360: kern U+2011 (nonbreaking hyphen) the same as U+2010 (hyphen)

Submitter:  Dave <barx>
Submitted:  Mon 14 Nov 2022 01:15:10 AM UTC
Category:  Core Severity:  2 - Minor
Item Group:  Rendering/Cosmetics Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Planned Release:  None
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Mon 28 Aug 2023 06:51:56 AM UTC, comment #2: 

original submission:

> \[u2011] was (ultimately) defined in tmac/fallbacks.tmac.
> Bug #63354 suggests some tweaks to that file.

One of those tweaks, ultimately applied before 1.23 shipped, was commenting out this definition, in commit fa1553c3.

Dave <barx>
Group Member
Wed 23 Nov 2022 10:25:17 PM UTC, comment #1: 

Fixing bug #59932 would probably also resolve this problem, and is a more general solution than focusing solely on \[u2011].

Dave <barx>
Group Member
Mon 14 Nov 2022 01:15:10 AM UTC, original submission:  

Over in bug #58930, we discussed a kerning problem with the \[u2011] solution implemented there (its comments 9 and 12 give examples to show the problem), but decided to kick that can down the road.  This ticket serves to make sure the can gets picked up again at some point.

\[u2011] was (ultimately) defined in tmac/fallbacks.tmacBug #63354 suggests some tweaks to that file.  But I don't think this problem falls into that realm, because I'm not convinced it's fixable in macro space.  Even a roff request to define new kernpairs (as bug #44244 asks for) wouldn't be sufficient without also a mechanism to query a font's existing kernpairs, in order to duplicate them for a new character.

Thus, unless I'm overlooking a more elegant solution, the fix would seem to require the underlying engine to recognize that U+2011 is a variant of U+2010 with different breaking properties but that should use the same kerning data.

Dave <barx>
Group Member


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