pitchedTrill with a chord?

[Valentin Villenave]

Hello everybody,

just a small question that occured to me (as the new bugmeister, I
don't want to fill a feature request without discussing it first :)

In the following snippet, the trill can be interpreted as a
chord-trill; however, the pitchedTrill indication prints only one
note:

\relative c'' {
  \grace <f a>8
  \pitchedTrill <e gis>2. \startTrillSpan <f a>
  <e gis>4 \stopTrillSpan
}

Bug or missing feature? Any workaround (other than polyphonic)?

Cheers,
Valentin