spacing problem whan mixing latin and cyrillic

[Pim Philipse]

I've entered a song title as "Pro Petra I" where "Pro Petra" is in cyrillic and
I is the latin digit "one". After lilypond is done with it, the space that
separated the I from the preceding word has disappeared.

Workaround: since the latin a is (oh happy phishers!) indistinguishable from the
cyrillic one, I used that one as the last character of Petra. That makes the
"space eating" disappear.

(Yes, the song is about Peter the Great)

Pim.