instrumentName doesn't appear when the very first note is an acciaccatura

[eliot bates]

> I'm not top posting.

%% instrumentName does not get printed on subsequent staffs 
%% if one staff begins with an acciaccatura figure.
%% shortInstrumentName seems to always work, however, and 
%% removing the acciaccatura immediately clears up the problem.
%% acciaccaturas in any position other than the first note do not cause
%% this problem.

\version "2.11"  % necessary for upgrading to future LilyPond versions.
\paper{ ragged-right=##t } 
#(set-default-paper-size "a4") 
#(set-global-staff-size 14) 
\layout {
        indent=#0
        \context { \Score 
                \remove "Bar_number_engraver" 
        } 
}

ILavta = \relative {
                \clef treble
                \key d \minor 
                #(set-time-signature 5 8 '(3 2)) 
                #(override-auto-beam-setting '(end * * * *)  3 8)
                #(override-auto-beam-setting '(end * * * *)  5 8)
                \set Staff.voltaSpannerDuration = #(ly:make-moment 5 8)

                \acciaccatura a'32 a16 bes c4 \acciaccatura c32 c16 bes a bes 
                a4.\prall \acciaccatura a16 a4 \break

                \acciaccatura c32 c16 d d4 d8. c16 
                c16 d8 \appoggiatura { c32[ des] } c8 d16 c \appoggiatura des32 
bes16 a bes~
                \time 3/8       bes4. 

                #(set-time-signature 5 8 '(3 2)) 
                #(override-auto-beam-setting '(end * * * *)  3 8)
                #(override-auto-beam-setting '(end * * * *)  5 8)
                \set Staff.voltaSpannerDuration = #(ly:make-moment 5 8) 
                \acciaccatura a32 a16 bes c4 \acciaccatura c32 c16 bes a bes 
                a4.\prall a4 \bar "||"
}


IUdu= \drummode {
                bd16-> sn sn sn sn-> \times 2/3 { sn32 sn sn } sn16 sn-> sn-> sn
                        sn16 bd sn bd-> sn sn sn sn sn-> sn64 sn sn sn 
                        sn16 \times 2/3 { r32 sn sn } sn16 sn-> r sn sn sn32 sn 
sn16-> sn32 sn
                        sn16-> sn-> sn-> bd-> sn sn sn sn sn-> sn64 sn sn sn 
                        bd8.-> bd16-> bd-> bd->
                        bd16-> sn sn sn sn-> \times 2/3 { sn32 sn sn } sn16 
sn-> sn-> sn
                        sn16 bd sn bd-> r4.
}

\new Score { <<
                \new Staff = "lavta" {
                        \set Staff.instrumentName = "lavta"
                        \set Staff.shortInstrumentName = "lavta"
                        \ILavta } 
                \new DrumStaff = "udu" {
                        \set DrumStaff.instrumentName = "udu"
                        \set DrumStaff.shortInstrumentName = "udu"              
        \IUdu                   
                }
        >>
}