Event sort works incorrect in Month View

[chuckn0rris]

Forum post

According to docs here https://bryntum.com/products/calendar/docs/api/Calendar/util/EventSorter#function-defaultSorterFn-static
Sorting should be by startDate
_This sorting method implement following rules:

Unscheduled events go before scheduled ones
Compare by floored start date
If equal, compare by floored duration
If equal, compare by start date
If equal, compare by duration_

In fact it's sorted by duration. See Breakfast is after Lunch and DInner

[ExtAnimal]

Fix is this in EventSorter.js:

    static interDaySorterFn(event1, event2) {
        // Handle event wrapping which is what MonthView does.
        event1 = event1.eventRecord || event1;
        event2 = event2.eventRecord || event2;

        const
            {
                startDate  : start1,
                isInterDay : event1InterDay
            } = event1,
            {
                startDate  : start2,
                isInterDay : event2InterDay
            } = event2;

        // Unscheduled events sort to the top.
        if (!start1) {
            return -1;
        }
        if (!start2) {
            return 1;
        }

        // InterDay events sort to the top (https://github.com/bryntum/support/issues/1693).
        if (event1InterDay !== event2InterDay) {
            return Number(event2InterDay) - Number(event1InterDay);
        }

        // If both events fit inside one day cell, the only sort order we care about is start time.
        if (!event1InterDay && !event2InterDay) {
            return start1 - start2;
        }

        // Sort Duration (longest first), then by ending date (furthest in future first), then by start timestamp.
        // This is *in-cell* sorting.
        return event2.durationMS - event1.durationMS || event2.endingDate - event1.endingDate || start1 - start2;
    }

@matsbryntse you could take this one.