Instrument labels incorrectly placed after hide empty staves is unchecked
OS - Windows 7
MuseScore revision - ea0cfcc
Steps taken to reproduce:
1. Open the attached score.
2. Open Style/General...
3. Check hide empty staves
4. Uncheck don't hide empty staves in first system
5. Click apply.
6. Uncheck hide empty staves.
7. Click apply.
Result: Instrument labels of staves that reappeared are placed incorrectly.
Expected: Instrument labels show up in the same place as from before hiding the staves.
Closing the dialog with OK, or Cancel moves the instrument labels back in the correct place.