vertical spacing of a staff with lyrics is irritating

[Eluze]

I'm flummoxed by the vertical spacing in the following example:

staff=\new Staff = staff \new Voice = voice { a'1 a'1 }
lyric=\context Lyrics = lyric \lyricsto voice { oh oh }

A =<< \staff \lyric >>

B=<< \staff \new Lyrics = lyric \with { alignAboveContext = staff } \lyric
>>

C=<< \new Lyrics = lyric   \staff   \lyric >>

 \markup { A \override #'(line-width . 25) \draw-hline } \A
 \markup { B \override #'(line-width . 25) \draw-hline } \B
 \markup { C \override #'(line-width . 25) \draw-hline } \C



% \markup { A \override #'(line-width . 25) \draw-hline } \A
% \markup { C \override #'(line-width . 25) \draw-hline } \C
% \markup { B \override #'(line-width . 25) \draw-hline } \B


the score after \A always has different vertical spacing: the distance from
the markup line increases and/or the distance between the staff and the
lyrics changes.

is there an explanation for this?

(the 2nd irritation is that I have to write A =<<  with a blank before the
equal sign and this isn't needed for B and C) 
Eluze



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