[BUG] RichAttributionWidget causes error due to un-mounted setState call

[JaffaKetchup]

What is the bug?

If using RichAttributionWidget with the 'start open, auto close' feature, if the widget/screen containing the widget is unmounted, the RAW still attempts a setState call, which results in an error.

How can we reproduce it?

Use the demonstration code at https://docs.fleaflet.dev/#demonstration. Add another screen to the app, and navigate to this screen within 3 seconds of the map widget being loaded.

Do you have a potential solution?

Check that the RichAttributionWidget is still mounted before calling setState.

Platforms

All

Severity

Erroneous: Prevents normal functioning and causes errors in the console

[JaffaKetchup]

Will be fixed by #1532.