Kornel,
I'm just thinking of dropping entirely features/chat, and
continuing on features/chat2.
Not sure about what happened with features/chat, but from
the web view I can only say it seems a critical and unrecoverable
spaghetti situation :D -- I have no clue of how I could do it!
On the other hand, features/chat2 seems OK and I recently added
a couple of clean-up patches that also fix whitespaces compliance
with LyX coding style (you want to checkout this branch, before
any further edits, to prevent conflicts).
T.