[Trunk] Playback icon isn't highlighted if viewing another loaded score and immediately playing using keyboard shortcut
1. Open two scores.
2. Close one.
3. Play immediately using keyboard shortcut.
Result: Playback icon isn't highlighted to indicate playback.
Discussion: Sometimes happens if you load a score and play - not always reproducible, however.
Using MuseScore 2.0 Nightly Build (5329) - Mac 10.6.8.