slur and tie collision

[Martial]

v2.8.1 win2k

They are collision with slur (up) or tie and musicglyph
prall, mordent, downbow etc... (not with trill)

\relative c'' {
   a'4\prall~a
   a\mordent ( a )
   a\longfermata (a )
   a\downbow ( a )
   a\trill ( a )
}

I use \markup to a tempory  solution

correctPos = ^\markup {\musicglyph #"scripts.prall" }

\relative c'' {
     a'\correctPos (  a)
}
--
Martial
http://cathemline.org