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[bug #63354] Refine fallbacks.tmac

From: Dave
Subject: [bug #63354] Refine fallbacks.tmac
Date: Sun, 20 Nov 2022 15:04:54 -0500 (EST)

Follow-up Comment #5, bug #63354 (project groff):

Another addendum:

Unicode's U+200B ZERO WIDTH SPACE has the semantics of groff's \: escape. 
However, the current definition for \[u200B] in fallbacks.tmac (\h'0') does
not have U+200B's essential breaking property:

$ cat u200B-test
.ll 1p
$ nroff -Ww u200B-test | cat -s

And sadly, while bug #58958 is unresolved, we can't do the obvious ".fchar
\[u200B] \:".  (.tr likewise doesn't work, though one wouldn't expect it to,
since its definitions are supposed to be glyphs, which \: isn't.)  I have no
other suggestions for how to tie this functionality to \[u200B].

So perhaps the best thing here is to comment out the \[u200B] definition, with
an additional comment saying it's awaiting a fix to #58958.  In the meantime,
\[u200B] will be unrecognized, but that's already the status quo (in 1.22.4,
and in git until less than a month ago), and is less misleading than
implementing it in a noncompliant way.  (I'm not sure how, or whether, \h'0'
effectively differs from \&.)


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