#3702 all calendar view

[samshr27]

Changes

added the all calendar view so you can filter what calendar's events you want to see on the calendar

Notes

at the first when a calendar was filtered, it would filter out every calendar, so no events would be displayed.

Screenshots

fresh page:

unfiltered:

filtered:

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Closes #3702

[wavehassman]

Very good start! With Josh's ticket merged in, you should be able to correctly filter events based on calendar. Right now, whenever I press a calendar, all events disappear even the ones from that calendar.

[JoshuaGoldberg]

Great work! Just a few requested changes. First off, if no filters are selected, then no events should be displayed (currently it displays all calendar events). This can be done by tweaking the service function to check calendarIds and not calendarIds?.length, and then replacing the undefined in calendarIds: selectedCalendarIds.length ? selectedCalendarIds : undefined with []. Second, all calendar filters should be enabled by default. This gets a little finicky, so you might need a useEffect.