Removed unnecessary comparisons

Improved internal documentation

lib/src/map/layers_stack.dart

@@ -1,5 +1,7 @@
 part of 'widget.dart';
 
+/// Batches all 'normal' layers into as few Stacks as possible whilst not moving
+/// any 'anchored' layers, and applies necessary transformations to the Stacks
 class _LayersStack extends StatefulWidget {
  const _LayersStack({
  required this.camera,
@@ -16,8 +18,6 @@ class _LayersStack extends StatefulWidget {
 }
 
 class _LayersStackState extends State<_LayersStack> {
- List<Widget> children = [];
-
  Iterable<Widget> _prepareChildren() sync* {
  final stackChildren = <Widget>[];
 
@@ -37,28 +37,30 @@ class _LayersStackState extends State<_LayersStack> {
  }
 
  for (final Widget child in widget.children) {
- if (child is AnchoredLayerStatefulMixin ||
- child is AnchoredLayerStatelessMixin) {
- if (stackChildren.isNotEmpty) yield prepareRotateStack();
- final overlayChild = _AnchoredLayerDetectorAncestor(child: child);
- yield widget.options.applyPointerTranslucencyToLayers
- ? TranslucentPointer(child: overlayChild)
- : overlayChild;
- } else {
+ if (child is! AnchoredLayer) {
  stackChildren.add(
  widget.options.applyPointerTranslucencyToLayers
  ? TranslucentPointer(child: child)
  : child,
  );
+ continue;
  }
+
+ if (stackChildren.isNotEmpty) yield prepareRotateStack();
+ final overlayChild = _AnchoredLayerDetectorAncestor(child: child);
+ yield widget.options.applyPointerTranslucencyToLayers
+ ? TranslucentPointer(child: overlayChild)
+ : overlayChild;
  }
  if (stackChildren.isNotEmpty) yield prepareRotateStack();
  }
 
+ List<Widget> _outputChildren = [];
+
  @override
  void initState() {
  super.initState();
- children = _prepareChildren().toList();
+ _outputChildren = _prepareChildren().toList();
  }
 
  @override
@@ -68,10 +70,10 @@ class _LayersStackState extends State<_LayersStack> {
  widget.camera != oldWidget.camera ||
  widget.options.applyPointerTranslucencyToLayers !=
  oldWidget.options.applyPointerTranslucencyToLayers) {
- children = _prepareChildren().toList();
+ _outputChildren = _prepareChildren().toList();
  }
  }
 
  @override
- Widget build(BuildContext context) => Stack(children: children);
+ Widget build(BuildContext context) => Stack(children: _outputChildren);
 }