[bug #55154] .tr has undocumented and inconsistent space-character restrictions

[Dave]

Follow-up Comment #7, bug #55154 (project groff):

[comment #6 comment #6:]
> Possibly, we should try deprecating both of these uses of `tr`,
> so that we can say simply that `tr` remaps *characters* (ordinary
> or special).  Full stop.

Now that this proposal has its own ticket (bug #64337), I'll respond there to
the parts of this comment specifically related to that.

> I don't think \| and \^ are too much of a challenge here. 
> They're still not _characters_, and we could introduce new
> directives to the font description file syntax to replace them.

I recall you've spoken about the font file's ability to alter their sizes
being a feature you've never seen used in practice, and maybe floated the idea
of deprecating this as well, but if there's a ticket for that proposal, I
couldn't find it.


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