Calendar fires 2 refresh events on adding a new task record

[pmiklashevych]

http://lh/master/bryntum-suite/calendar/examples/basic/

calendar.activeView.eventStore.on({
    catchAll(e) {
        console.log('eventStore', e.type);
    }
});

calendar.activeView.on({
    catchAll(e) {
        console.log('view', e.type);
    }
});

Adding fires add and update. Both call refreshSoon. Sometimes refresh is fired once, sometimes 2 times.

calendar.activeView.eventStore.add({ startDate : new Date(2020, 9, 12, 7), endDate : new Date(2020, 9, 12, 8), name : 'Test' });

YearView, DayView, EventTooltip fail due to this issue. Especially in Firefox.