qtlib.preferences: calls QSettings.sync() on save so that no pref is lost on app quit.
qtlib.preferences: calls QSettings.sync() on save so that no pref is lost on app quit.

--HG--
extra : convert_revision : svn%3A7b8128f5-b82e-4125-a33a-c49d6b68abe0/qtlib/trunk%4082

hsoft/qtlib