refactor: microtask

lib/screens/news.dart

@@ -20,8 +20,7 @@ class NewsScreenState extends State<NewsScreen> {
   @override
   initState() {
     super.initState();
-    // FIXME:
-    nextTick(() async {
+    Future.microtask(() async {
       // Check if there are unread notification items.
       // 1 item is enough since count is not displayed for now.
       var items = await Provider.of<AuthModel>(context)

lib/utils/utils.dart

@@ -51,13 +51,6 @@ Color getFontColorByBrightness(Color color) {
   return showWhite ? Colors.white : Colors.black;
 }
 
-void nextTick(Function callback, [int milliseconds = 0]) {
-  // FIXME:
-  Future.delayed(Duration(milliseconds: 0)).then((_) {
-    callback();
-  });
-}
-
 TextSpan createLinkSpan(
   BuildContext context,
   String text,