force-hshift and dotted rhythms, 2.19.57

[Knute Snortum]

I have found a behavior in 2.19.57 that I believe is a bug.  It involves
force-hshift and the dot of a dotted rhythm.  Consider the following input
file:

\version "2.19.57"
\language "english"

global = {
  \time 6/8
  \key af \major
}

rightUpper = { bf'4. \override NoteColumn.force-hshift = -3 af' }
rightLower = { r8 <c' gf'> q q q q }
leftHand = { af,8 <af ef'> q q q q }

rightHand = <<
  \new Voice { \voiceOne \rightUpper }
  \new Voice { \voiceTwo \rightLower }
>>

\score {
  \new PianoStaff <<
    \new Staff { \global \rightHand }
    \new Staff { \global \clef bass \leftHand }
  >>
}

I've made the shift large to exaggerate the problem.  The note head and
stem of the af' move to the left, but the dot does not shift all the way.
See attached.

---
Knute Snortum
(via Gmail)

ForceNoteShift2_19_57.png
Description: PNG image