[bug #63076] [tmac] add Russian language support

[G. Branden Robinson]

Update of bug #63076 (project groff):

                  Status:                    None => In Progress            
             Assigned to:                    None => gbranden               

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Follow-up Comment #15:


[comment #13 comment #13:]
> > I guess the main things I'm curious about are how you solved the problem
of KOI8-R having code points in the same space as C1 controls (which groff
uses for internal purposes).
> I did not handle that case in any special way. The resulting document looks
as it is supposed to (including the Cyrillic "a" characters (_а_), which C1
translates to). Or this problem can manifest itself in some unobvious way?

Apparently it can.  In your example document, your use of the character ≈
(in KOI8, this is hex 0x97 or decimal 151) is rejected by GNU troff upon
input.

I'm attaching a revised version of your document, and a stack of diffs I have
pending after applying your patch.

Let me know what you think.

(file #54463, file #54464)

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Additional Item Attachment:

File name: groff-ru-test-revised-gbr.ms   Size:3 KB
   
<https://file.savannah.gnu.org/file/groff-ru-test-revised-gbr.ms?file_id=54463>

File name: ru-revisions.diff              Size:10 KB
    <https://file.savannah.gnu.org/file/ru-revisions.diff?file_id=54464>



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