[BUG] MapOptions.keepAlive has no effect since v6.0.0-dev.1

[JaffaKetchup]

What is the bug?

The keepAlive option in MapOptions has no effect as of the first v6 prerelease, as the AutomaticKeepAliveClientMixin seems to have been removed in #1551.

How can we reproduce it?

Use the Demo snippet inside a PageView, with something else on another page. Load the map, and move it to a different position. Then move to the second page, and reload the map page. It will be back at the start position.

Do you have a potential solution?

Add the appropriate mixin and fields back into FlutterMapStateContainer.

Platforms

All

Severity

Obtrusive: Prevents normal functioning but causes no errors in the console