removed useless googlemap init workaround

lib/widgets/fullscreen/info/location_section.dart

@@ -7,7 +7,6 @@ import 'package:aves/utils/geo_utils.dart';
 import 'package:aves/widgets/common/aves_filter_chip.dart';
 import 'package:aves/widgets/common/icons.dart';
 import 'package:aves/widgets/fullscreen/info/info_page.dart';
-import 'package:aves/widgets/fullscreen/info/map_initializer.dart';
 import 'package:flutter/material.dart';
 import 'package:google_maps_flutter/google_maps_flutter.dart';
 import 'package:outline_material_icons/outline_material_icons.dart';
@@ -182,8 +181,8 @@ class ImageMapState extends State<ImageMap> with AutomaticKeepAliveClientMixin {
               child: Container(
                 color: Colors.white70,
                 height: 200,
-                child: GoogleMapInitializer(
+                child: GoogleMap(
-                  builder: (context) => GoogleMap(
+                  // GoogleMap init perf issue: https://github.com/flutter/flutter/issues/28493
                   initialCameraPosition: CameraPosition(
                     target: widget.latLng,
                     zoom: widget.initialZoom,
@@ -208,7 +207,6 @@ class ImageMapState extends State<ImageMap> with AutomaticKeepAliveClientMixin {
             ),
           ),
         ),
-        ),
         const SizedBox(width: 8),
         Column(children: [
           IconButton(

lib/widgets/fullscreen/info/map_initializer.dart

@@ -1,65 +0,0 @@
-import 'dart:async';
-
-import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
-import 'package:google_maps_flutter/google_maps_flutter.dart';
-import 'package:meta/meta.dart';
-
-// workaround to Google Maps initialization blocking the dart thread
-// cf https://github.com/flutter/flutter/issues/28493
-// it loads first Google Maps in an isolate, and then build the desired map
-
-class GoogleMapInitializer extends StatefulWidget {
-  final WidgetBuilder builder, errorBuilder, placeholderBuilder;
-
-  const GoogleMapInitializer({
-    @required this.builder,
-    this.errorBuilder,
-    this.placeholderBuilder,
-  });
-
-  @override
-  _GoogleMapInitializerState createState() => _GoogleMapInitializerState();
-}
-
-class _GoogleMapInitializerState extends State<GoogleMapInitializer> {
-  Future<void> initializer;
-
-  @override
-  void initState() {
-    super.initState();
-    initializer = compute(_preload, null);
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    return FutureBuilder(
-        future: initializer,
-        builder: (context, snapshot) {
-          if (snapshot.hasError) {
-            return widget.errorBuilder?.call(context) ?? const Icon(Icons.error_outline);
-          } else if (snapshot.connectionState == ConnectionState.done) {
-            return widget.builder(context);
-          } else {
-            return widget.placeholderBuilder?.call(context) ?? const SizedBox.shrink();
-          }
-        });
-  }
-}
-
-Future<void> _preload(_) async {
-  final mapCreatedCompleter = Completer();
-  GoogleMap(
-    compassEnabled: false,
-    mapToolbarEnabled: false,
-    rotateGesturesEnabled: false,
-    scrollGesturesEnabled: false,
-    zoomGesturesEnabled: false,
-    tiltGesturesEnabled: false,
-    buildingsEnabled: false,
-    initialCameraPosition: const CameraPosition(target: LatLng(0, 0), zoom: 20),
-    onMapCreated: (controller) => mapCreatedCompleter.complete(),
-  );
-  return mapCreatedCompleter.future;
-}