nowIndicator does not update after changing now

[hansthen]

Checklist

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Is this feature for a specific connector (React/Angular/etc)?

No connector in particular

Feature Description

We use fullcalendar to display past events together with a leaflet.timeline map object, so our users can compare their past calendar to their past locations. We'd like to add a now indicator to the calendar so the active time on the calendar matches the active time on the map object. Each time the user changes the time in the timeline, we want fullcalendar to change the now indicator to match.

However, currently, the now indicator can no longer be set after render is called on the calendar.

See https://codepen.io/hansthen/pen/KKYRYoq?editors=0010 for a very simplified code flow.

[acerix]

The issue seems to be that the nowIndicator doesn't update after it's rendered, I believe it's the same thing causing this issue:

#5753

As a workaround, you could force the calendar to re-render after changing now like this:

https://codepen.io/acerix/pen/PogeMgz?editors=1011

To avoid that re-render, it may work better to use a background event instead to show the current time.

[hansthen]

Thanks for the suggesting to use a background event. We decided to go with this approach for now. We also noted that the nowIndicator automatically increments with the amount of time passed, which is not what we want.

iI think it would be very useful to have a settable nowIndicator for the use cases I described above.