improved internal cache cleaning

Author: deckerst

lib/widgets/about/data_usage.dart

@@ -9,6 +9,7 @@ import 'package:aves/widgets/common/extensions/build_context.dart';
 import 'package:aves/widgets/common/identity/aves_donut.dart';
 import 'package:aves/widgets/common/identity/buttons/outlined_button.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_map/flutter_map.dart';
 import 'package:provider/provider.dart';
 
 class AboutDataUsage extends StatefulWidget {
@@ -88,7 +89,10 @@ class _AboutDataUsageState extends State<AboutDataUsage> with FeedbackMixin {
                       onPressed: () async {
                         await storageService.deleteTempDirectory();
                         await storageService.deleteExternalCache();
+                        // Glide cache by default in `cache/image_manager_disk_cache/`
                         await mediaFetchService.clearImageDiskCache();
+                        // flutter_map cache in `cache/fm_cache/`
+                        await BuiltInMapCachingProvider.getOrCreateInstance().destroy(deleteCache: true);
                         imageCache.clear();
                         _reload();
                         setState(() {});