fixed default list add requiring a widget rebuild to change color

lib/pages/home.dart

@@ -27,9 +27,10 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
       _selectedDrawerIndex >= 0 && _selectedDrawerIndex < _namespaces.length
           ? _namespaces[_selectedDrawerIndex]
           : null;
-  int _selectedDrawerIndex = -1;
+  int _selectedDrawerIndex = -1, _previousDrawerIndex = -1;
   bool _loading = true;
   bool _showUserDetails = false;
+  Widget drawerItem;
 
   @override
   void afterFirstLayout(BuildContext context) {
@@ -72,7 +73,13 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
         title: Text('Settings'),
         leading: Icon(Icons.settings),
         onTap: () {
-          Navigator.push(context, MaterialPageRoute(builder: (context) => SettingsPage()));
+          Navigator.push(context, MaterialPageRoute(
+              builder: (context) => SettingsPage()))
+              .whenComplete(() =>
+              setState((){
+                //returning from settings, this needs to be force-refreshed
+                drawerItem = _getDrawerItemWidget(_selectedDrawerIndex, forceReload: true);
+          }));
         },
       )
     ]);
@@ -81,6 +88,8 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
   @override
   Widget build(BuildContext context) {
     var currentUser = VikunjaGlobal.of(context).currentUser;
+    if(_selectedDrawerIndex != _previousDrawerIndex)
+      drawerItem = _getDrawerItemWidget(_selectedDrawerIndex);
 
     return new Scaffold(
       appBar: AppBar(
@@ -151,13 +160,14 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
           ),
         ),
       ])),
-      body: _getDrawerItemWidget(_selectedDrawerIndex),
+      body: drawerItem,
     );
   }
 
-  _getDrawerItemWidget(int pos) {
+  _getDrawerItemWidget(int pos, {bool forceReload = false}) {
+    _previousDrawerIndex = pos;
     if (pos == -1) {
-      return new LandingPage();
+      return forceReload ? new LandingPage(key: UniqueKey()) : new LandingPage();
     }
     return new NamespacePage(namespace: _namespaces[pos]);
   }

lib/pages/landing_page.dart

@@ -1,11 +1,18 @@
 import 'package:flutter/material.dart';
 import 'package:vikunja_app/global.dart';
 
+import 'dart:developer';
+
 import '../components/AddDialog.dart';
 import '../components/TaskTile.dart';
 import '../models/task.dart';
 
 class LandingPage extends StatefulWidget {
+
+  const LandingPage(
+      {Key key})
+      : super(key: key);
+
   @override
   State<StatefulWidget> createState() => LandingPageState();
 
@@ -15,12 +22,20 @@ class LandingPageState extends State<LandingPage> {
   int defaultList;
   List<Task> _list;
 
+  void _updateDefaultList() {
+    VikunjaGlobal.of(context)
+        .listService
+        .getDefaultList()
+        .then((value) => setState(() => defaultList = value == null ? null : int.tryParse(value)));
+  }
+
   @override
   void initState() {
-    Future.delayed(Duration.zero, () =>
-    VikunjaGlobal.of(context).listService.getDefaultList().then((value) => setState(() => defaultList = value == null ? null : int.tryParse(value))));
+    Future.delayed(Duration.zero, () => _updateDefaultList());
     super.initState();
   }
+
+
   @override
   Widget build(BuildContext context) {
     if(_list == null)

lib/pages/settings.dart

@@ -27,7 +27,7 @@ class SettingsPageState extends State<SettingsPage> {
           ListTile(
             title: Text("Default List"),
             trailing: DropdownButton(
-              items: taskListList.map((e) => DropdownMenuItem(child: Text(e.title), value: e.id)).toList(),
+              items: [DropdownMenuItem(child: Text("None"), value: null,), ...taskListList.map((e) => DropdownMenuItem(child: Text(e.title), value: e.id)).toList()],
               value: defaultList,
               onChanged: (value){
                 setState(() => defaultList = value);