Lyric extender extends too far when there's a grace note before the next note

[Arvid Grøtting]

\version "2.8.1"

%% Here, the first two lyric extenders extend way too far.  Visually,
%% it looks like the extender thinks the acciaccatura for the
%% following note is part of its syllable.

%% The third extender shows a workaround using a hidden note and a
%% blank syllable.

\score {
 \relative c'' {
   \time 3/4
   r4 r \acciaccatura es8 d4~ d4 r r
   r4 r \grace es8 d4~ d4 r r
   r4 r \acciaccatura es8 d4~ d4 <<r {\hideNotes d \unHideNotes} >> r
   r4 r \acciaccatura es8 d4~ d4 r r
   d2
 }
 \addlyrics { test, __ test, __ test, __ "" test, __ test. }

 \layout {}
 }



--

Arvid