fix: prefer imports from 'pkg:flutter/widgets.dart' instead of 'material'

lib/src/gestures/positioned_tap_detector_2.dart

@@ -9,7 +9,7 @@
 import 'dart:async';
 import 'dart:math';
 
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 
 typedef TapPositionCallback = void Function(TapPosition position);
 

lib/src/layer/attribution_layer/rich/source.dart

@@ -1,4 +1,5 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/material.dart' show Tooltip;
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:meta/meta.dart';
 

lib/src/layer/attribution_layer/rich/widget.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
-import 'package:flutter/material.dart';
+import 'package:flutter/material.dart' show IconButton, Icons, Theme, Colors;
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 
 /// Position to anchor [RichAttributionWidget] to relative to the [FlutterMap]

lib/src/layer/attribution_layer/simple.dart

@@ -1,4 +1,5 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/material.dart' show Theme;
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 
 /// A simple, classic style, attribution layer

lib/src/layer/scalebar/scalebar.dart

@@ -2,7 +2,7 @@ import 'dart:math';
 import 'dart:typed_data';
 import 'dart:ui';
 
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:latlong2/latlong.dart';
 

lib/src/layer/shared/layer_projection_simplification/state.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map/src/layer/shared/layer_projection_simplification/widget.dart';
 import 'package:flutter_map/src/misc/simplify.dart';

lib/src/layer/shared/layer_projection_simplification/widget.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/src/layer/shared/layer_projection_simplification/state.dart';
 
 /// A [StatefulWidget] that includes the properties used by the [State] component

lib/src/layer/shared/line_patterns/pixel_hiker.dart

@@ -1,4 +1,5 @@
-import 'package:flutter/material.dart';
+import 'dart:ui';
+
 import 'package:flutter_map/flutter_map.dart';
 import 'package:meta/meta.dart';
 

lib/src/layer/tile_layer/tile_builder.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 
 /// Builder function that returns a [TileBuilder] instance.
@@ -56,15 +56,7 @@ Widget coordinateDebugTileBuilder(
     ),
     child: Stack(
       fit: StackFit.passthrough,
-      children: [
-        tileWidget,
-        Center(
-          child: Text(
-            readableKey,
-            style: Theme.of(context).textTheme.headlineSmall,
-          ),
-        ),
-      ],
+      children: [tileWidget, Center(child: Text(readableKey))],
     ),
   );
 }
@@ -88,15 +80,7 @@ Widget loadingTimeDebugTileBuilder(
     ),
     child: Stack(
       fit: StackFit.passthrough,
-      children: [
-        tileWidget,
-        Center(
-          child: Text(
-            time,
-            style: Theme.of(context).textTheme.headlineSmall,
-          ),
-        ),
-      ],
+      children: [tileWidget, Center(child: Text(time))],
     ),
   );
 }

lib/src/layer/tile_layer/tile_layer.dart

@@ -3,7 +3,7 @@ import 'dart:math';
 
 import 'package:collection/collection.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map/src/layer/tile_layer/tile.dart';
 import 'package:flutter_map/src/layer/tile_layer/tile_bounds/tile_bounds.dart';

lib/src/layer/tile_layer/tile_provider/asset/provider.dart

@@ -1,7 +1,7 @@
 import 'dart:convert';
 
-import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 
 /// Fetch tiles from the app's shipped assets, where the tile URL is a path

lib/src/map/camera/camera.dart

@@ -1,6 +1,6 @@
 import 'dart:math' as math;
 
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map/src/map/inherited_model.dart';
 import 'package:flutter_map/src/misc/deg_rad_conversions.dart';

lib/src/map/controller/map_controller.dart

@@ -1,6 +1,6 @@
 import 'dart:async';
 
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 import 'package:flutter_map/src/map/inherited_model.dart';
 import 'package:flutter_map/src/misc/move_and_rotate_result.dart';

lib/src/map/inherited_model.dart

@@ -1,4 +1,4 @@
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_map/flutter_map.dart';
 
 /// Allows descendents of [FlutterMap] to access the [MapCamera], [MapOptions]