Up version to 2.3.0, AboutDialog.
Change the size of dialog's button strings to before showing the dialog, to avoid the flicker.
Bugfix: make it possible to download tutorials for an object later.
big change to SharedPreferences: make all the values in RubikScores save their preferences just-in-time, and not on the exit of the app.
SharedPreferences
more work on Preferences
minor
simplify Preferences interface of OSInterface
editor.commit -> editor.apply
Move preferences to JIT model.
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