[Groff] Question concerning Czech man pages in UTF-8

[Mike Fabian]

Running the following commandline 

    zcat /usr/share/man/cs/man1/man.1.gz | groff -mandoc -Tutf8 - | less

in an UTF-8 locale in an UTF-8 capable terminal results in the display
of wrong characters in a Czech man page:

    http://www.suse.de/~mfabian/screenshots/czech-man-page-utf-8.png

But the following commandline 

   zcat /usr/share/man/cs/man1/man.1.gz | (LC_ALL=cs_CZ.ISO-8859-2 groff 
-mandoc -Tlatin1 - ) | iconv -f iso-8859-2 -t utf-8 | less

appears to work fine:

    
http://www.suse.de/~mfabian/screenshots/czech-man-page-utf-8-with-help-of-iconv.png

Why is it necessary to force groff to run in cs_CZ locale and use
-Tlatin1 (or -Tascii8) and convert the result to UTF-8 instead of
using -Tutf8 directly?

-- 
Mike Fabian   <address@hidden>   http://www.suse.de/~mfabian
睡眠不足はいい仕事の敵だ。