Adjusted default MapOptions.cameraConstraint to prevent out-of-bounds viewing

Updated CHANGELOG

Author: JaffaKetchup

CHANGELOG.md

@@ -24,6 +24,7 @@ Contains the following user-affecting changes:
 - 🟡 Replaced `Marker.anchor` with `Marker.alignment` that uses built-in `Alignment` object - [#1659](https://github.com/fleaflet/flutter_map/pull/1659)
 - 🟡 Replaced `Marker.builder` with non-builder `Marker.child` - [#1659](https://github.com/fleaflet/flutter_map/pull/1659)
 - 🟡 Changed `TileLayer.retinaMode` behaviour - [#1673](https://github.com/fleaflet/flutter_map/pull/1673) for [#1670](https://github.com/fleaflet/flutter_map/issues/1670)
+- 🟡 Changed some default arguments, including `TileLayer.panBuffer` and `MapOptions.cameraConstraint` - multiple PRs
 - 🔴 Removed `CustomPoint` in favour of extension methods on `Point<T>` - [#1585](https://github.com/fleaflet/flutter_map/pull/1585) for [#1522](https://github.com/fleaflet/flutter_map/issues/1522)
 - 🔴 Removed `MoveAndRotateResult` in favour of a `Record` in format of `({bool moveSuccess, bool rotateSuccess})` - [#1636](https://github.com/fleaflet/flutter_map/pull/1636)
 - 🔴 Removed `Anchor`, `AnchorPos`, and all anchor related terminology - [#1659](https://github.com/fleaflet/flutter_map/pull/1659)

lib/src/map/options/options.dart

@@ -308,7 +308,10 @@ class MapOptions {
       _cameraConstraint ??
       (maxBounds != null
           ? CameraConstraint.contain(bounds: maxBounds!)
-          : const CameraConstraint.unconstrained());
+          : CameraConstraint.contain(
+              bounds:
+                  LatLngBounds(const LatLng(-90, -180), const LatLng(90, 180)),
+            ));
 
   @override
   bool operator ==(Object other) =>