\transpose and \quoteDuring

[caagr98]

It appears \transpose has no effect on \quoteDuring. \transposition can 
be abused to fix it, but that doesn't affect midi playback. How can I 
work around this?

```
\version "2.18.2"

foo = {c' d' e' f'}
\addQuote foo \foo
<<
  \new Staff \quoteDuring foo s1
  \new Staff \transpose c c' \quoteDuring foo s1
  \new Staff \foo
  \new Staff \transpose c c' \foo
>>
```