collision bug?

[Kieren MacMillan]

Hi all,

There appear to be at least two collisions in this small snippet that are 
unsightly: the first flat and the preceding rest, and the second flat and the 
preceding ledger line.
Regression?

Thanks,
Kieren.
________________________

\version "2.13.25"
\include "english.ly"

thenotesI = \relative g' {
  g2( af)
}
thenotesII = \relative af {
  r8 af( df ef f2)
}

\score {
  \new Staff << \thenotesI \\ \thenotesII >>
}