-Always use self.modelfilter instead of self.tree.get_model()
-filter twice to show groups with no contacts inside in the correct expand state when showingOfflines. ( We
can't expand the group before we filter, and we need to filter to effectively show tree expand state in model )
-UNSURE : call _adjust_group_expand_collapse_state() only if filtering in on_model_row_has_child_toggled(). That
seems sufficient and when not filtering, it works better with :
-when contact change status, don't refilter, only adjust group row state. Steve-e, do we need to filter in a
case I don't see ?
-in visible_func : Don't initialize 'accounts' var if not needed
-Don't draw anything in add_contact(), that seems to be done somewhere else anyway
cc97c3ce7b