Events are fetched with stale start/end after changing firstDay

[acerix]

Reduced Test Case

https://stackblitz.com/edit/github-9cf81z-xgcta3?file=src%2FDemoApp.vue

Do you understand that if a reduced test case is not provided, we will intentionally delay triaging of your ticket?

• I understand

Which connector are you using (React/Angular/etc)?

Vue

Bug Description

Click "next firstDay" to increment firstDay and call refetchEvents.

The start and end in the events function do not match the updated view, so the example event does not fill the view.

As a workaround, refetchEvents can be called after a timeout:

https://stackblitz.com/edit/github-9cf81z-jsvoxt?file=src%2FDemoApp.vue

I tried the same in vanilla and it works without the timeout so that issue seems specific to Vue:

https://codepen.io/acerix/pen/abxxrxd?editors=0011

It also seems events should automatically be refetched when the visible range changes after setting firstDay which currently doesn't happen.

Reported in https://fullcalendar.freshdesk.com/a/tickets/8402