[Trunk] Changing icon size has different effect between empty state and open score
S1 - Blocker
1. Have no score open.
2. Open Preferences.
3. Change horizontal icon size to 40.
4. Open score.
Expected result: The size is the same.
Actual result: The toolbars have expanded.
Discussion: Will contract or expand (randomly I think) if you have a score open when changing and closing (and perhaps re-opening).
Using MuseScore 2.0 Nightly Build (4300) - Mac 10.4.11.
Setting no longer relevant in 4.x redesigned UI.