Automatically apply new dark theme settings

lib/main.dart

@@ -28,7 +28,7 @@ void subMain() async {
   ));
 }
 
-class ComunicApplication extends StatelessWidget {
+class ComunicApplication extends StatefulWidget {
   final PreferencesHelper preferences;
 
   const ComunicApplication({
@@ -37,12 +37,22 @@ class ComunicApplication extends StatelessWidget {
   })  : assert(preferences != null),
         super(key: key);
 
+  @override
+  ComunicApplicationState createState() => ComunicApplicationState();
+}
+
+class ComunicApplicationState extends State<ComunicApplication> {
+  /// Use this method to force the application to rebuild
+  void refresh() => setState(() {});
+
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
       debugShowCheckedModeBanner: false,
       home: AccountHelper.isUserIDLoaded ? InitializeWidget() : LoginRoute(),
-      theme: preferences.preferences.enableDarkMode ? ThemeData.dark() : null,
+      theme: widget.preferences.preferences.enableDarkMode
+          ? ThemeData.dark()
+          : null,
     );
   }
 }

lib/ui/routes/settings/application_settings.dart

@@ -74,6 +74,7 @@ class __ApplicationSettingsScreenState
   /// Apply new settings
   _updatedSettings() {
     setState(() {});
+    applyNewThemeSettings(context);
   }
 }
 

lib/utils/ui_utils.dart

@@ -1,4 +1,5 @@
 import 'package:comunic/helpers/preferences_helper.dart';
+import 'package:comunic/main.dart';
 import 'package:comunic/ui/routes/full_screen_image.dart';
 import 'package:comunic/ui/widgets/dialogs/auto_sized_dialog_content_widget.dart';
 import 'package:comunic/utils/intl_utils.dart';
@@ -222,3 +223,7 @@ void showAboutAppDialog(BuildContext context) {
         ),
       ]);
 }
+
+/// Apply new theme settings
+void applyNewThemeSettings(BuildContext context) =>
+    context.findAncestorStateOfType<ComunicApplicationState>().refresh();