[Trunk] Double-clicking object in palette does not apply to note correctly

1. Create score.
2. Add note.
3. Click on note (to select it).
4. Double-click acciaccatura in the palette.
(Expected result: Acciaccatura appears next to normal note)
5. Drag acciaccatura onto score.

Actual result: Acciaccatura applies itself to note without reaching it.

Using MuseScore 2.0 Nightly Build (4620) - Mac 10.6.8.