Add [WillPopScope] on tablet mode

lib/ui/routes/main_route/main_route.dart

@@ -72,6 +72,15 @@ abstract class MainController extends State<MainRoute> {
   void popUntilMainRoute() => Navigator.of(context).popUntil((settings) =>
       ModalRoute.of(context).isCurrent || !ModalRoute.of(context).isActive);
 
+  /// Go to the previous page (use for [WillPop] widget)
+  @protected
+  Future<bool> willPop() async {
+    if (numberOfPages == 1) return true;
+
+    popPage();
+    return false;
+  }
+
   /// Open notifications page
   void openNotificationsPage() => pushPage(PageInfo(
       type: PageType.NOTIFICATIONS_PAGE, child: NotificationsScreen()));

lib/ui/routes/main_route/smartphone_route.dart

@@ -21,14 +21,6 @@ class _MainRouteState extends MainController {
   PageInfo get defaultPage =>
       PageInfo(type: PageType.NOTIFICATIONS_PAGE, child: NotificationsScreen());
 
-  /// Allows to go to previous tab
-  Future<bool> _willPop() async {
-    if (numberOfPages == 1) return true;
-
-    popPage();
-    return false;
-  }
-
   @override
   Widget build(BuildContext context) {
     return Container(
@@ -36,7 +28,7 @@ class _MainRouteState extends MainController {
       child: SafeArea(
         // Avoid OS areas
         child: WillPopScope(
-          onWillPop: _willPop,
+          onWillPop: willPop,
           child: Scaffold(
             appBar: currentPage.hideNavBar
                 ? null

lib/ui/routes/main_route/tablet_route.dart

@@ -32,9 +32,12 @@ class _TabletRouteState extends MainController {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      appBar: _buildAppBar(),
-      body: _buildBody(),
+    return WillPopScope(
+      onWillPop: willPop,
+      child: Scaffold(
+        appBar: _buildAppBar(),
+        body: _buildBody(),
+      ),
     );
   }