incorrect spacing on Vota Brackets when Cord names are present.

[John Sellers]

In the example volta-chord-names.ly processed with LilyPond version 
2.2.4 on the website at: 
http://lilypond.org/doc/v2.2/input/test/out-www/collated-files.html , 
there is too much vertical spacing between the staff and the chordname,  
and too much vertical spacing between the chordname and the volta 
alternative endings brackets.

In my netscape browser pointed at 
http://lilypond.org/doc/v2.2/input/test/out-www/collated-files.html
the vertical spacing between the top of the staff to the mid point of 
the chord name appears to be exactly the difference in hight between the 
bottom and top lines of the staff.  The same difference appears in 
vertical spacing between the mid point of the chord name to the base of 
the bracket.

Also, I saw different behavior between LilyPond version 2.2.4 and 2.0.0 
in this regard.