Issue 1581 in lilypond: Pitched trill between tied notes causes `unterminated tie' warning

[lilypond]

Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Low

New issue 1581 by address@hidden: Pitched trill between tied notes  
causes `unterminated tie' warning
http://code.google.com/p/lilypond/issues/detail?id=1581

\version "2.13.55"

\relative c' {
  \pitchedTrill
  c1~\startTrillSpan d
  c1\stopTrillSpan
}

%{
music.ly:5:5: warning: unterminated tie
  c1~
     \startTrillSpan d
%}

The Tie_engraver should ignore TrillPitchGroup when acknowledging grobs  
supporting note-head-interface.