> I don't fully understnad why this is happening.  iiuc, the purpose of
 > checking for previous split is to see if the (cons window parent) refer
 > split has already happened, to avoid doing it again.  Instead of doing
 > this, I just use a vriable called `n-set' which determines if the parent
 > window has already been split with the cons refer argument, so I don't
 > belive this is neccasary.

I think my code is over-engineered in this regard.  Fact is that you
create a new parent window where you should use the existing one.

 > Nice, can you send the whole diff.

Attached.  It's a bit more than that and comes without warranty.  The
elisp manual has not been updated in this regard.

martin