chords and page layout anomality

[Bruce McIntyre]

> I'm not top posting, really

In the following snippet the first system is spaced vertically wider 
than the others on the first page. This effect goes away when there
are chords in the first four bars.

Also all the chords on the first page are spaced closer to the saff 
than those on the second. 

Should the skyline also be different for the last bar of each staff? 
I prefer that the shape of the last bar of each system be found in 
every bar...

--Bruce

\version "2.11.23"
\paper { ragged-right = ##t }
notes = \relative c ''{ 
  \repeat unfold 15 {\repeat unfold 4 {c4 c4 c4 c4}}
}
harmony = \chordmode {
  \repeat unfold 4 {r1} \break
  \repeat unfold 14 {\repeat unfold 4 {c4 r2.} \break}
}
\score { 
  << \new ChordNames = "chords" {  \harmony }
     \new Staff = "tpt"  {\notes } >>
  \layout {  #(ly:set-option 'debug-skylines #t) }
}