Strange Pedal and Trill behavior maybe a bug?

[Renato Biolcati Rinaldi]

I found this weird behaviour if Trill (on right hand) and SustainDown (on
left hand) are used simultanously on the first measure of a piano staff.
Take the example below: the trill is not centered with the note head as it
would be without the \sustainDown on bottom staff.
I used a tweak with:  _\markup {\musicglyph #"pedal.Ped" \hspace #-1.4 "."}
Please note that the \musicglyph of the Pedal has no "dot" as the
sustainDown, so I had to add that \hspace #-1.4 "." piece. If there is a
command for Ped with a "dot" let me know, because I haven't seen it on the
list. If not, it may be a good idea to add it.
This way the Ped. is not well aligned, but if I use \hspace inside the
markup to move it on the left, I have the very same problem with the trill
on top staff. Therefore I used this override:
\once \override TextScript #'extra-offset = #'( -2.0 . 0.0 )
And now it looks OK.

%%%begin lilypond code%%%
\version "2.11.40"
\include "english.ly"
     upper = \relative c'' {
       \clef treble
       \key ef \major
       \time 12/8
              
f4.^\markup { \finger "23" }\startTrillSpan \grace { e16\stopTrillSpan
([f16] } g8-.-3) g-4 (d-1) ef4.-2 (c-1) 
              }
              
              lower = \relative c {
       \clef bass
       \key ef \major
       \time 12/8
              
 bf8-.\sustainDown <f' d'!> (<bf d af'>)\sustainUp       b,-.\sustainDown <g' 
f'>
(<d' f g>)\sustainUp    c,-.\sustainDown <g' ef'> (<c ef g>)\sustainUp
c,-.\sustainDown <gf' ef'> (<c ef gf>)\sustainUp        %7
              }
     \score  
         {
        \new PianoStaff  <<
           \set PianoStaff.instrumentName = "Piano  "
           \new Staff = "upper" \upper
           \new Staff = "lower" \lower
        >>
        \layout {   \context {
      \Score
      \override NonMusicalPaperColumn
      #'line-break-system-details =
      #'((alignment-offsets . (0 -13))) } }
        \midi { }
     }

%%%end lilypond code%%%
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