Generic fixes (#1282)

* New versions

* Fix unspent coins issue

* Fix white screen issues for some users

lib/src/screens/exchange_trade/exchange_trade_page.dart

@@ -283,15 +283,17 @@ class ExchangeTradeState extends State<ExchangeTradeForm> {
 
       if (state is TransactionCommitted) {
         WidgetsBinding.instance.addPostFrameCallback((_) {
-          showPopUp<void>(
-              context: context,
-              builder: (BuildContext popupContext) {
-                return AlertWithOneAction(
-                    alertTitle: S.of(popupContext).sending,
-                    alertContent: S.of(popupContext).transaction_sent,
-                    buttonText: S.of(popupContext).ok,
-                    buttonAction: () => Navigator.of(popupContext).pop());
-              });
+          if (context.mounted) {
+            showPopUp<void>(
+                context: context,
+                builder: (BuildContext popupContext) {
+                  return AlertWithOneAction(
+                      alertTitle: S.of(popupContext).sending,
+                      alertContent: S.of(popupContext).transaction_sent,
+                      buttonText: S.of(popupContext).ok,
+                      buttonAction: () => Navigator.of(popupContext).pop());
+                });
+          }
         });
       }
     });

lib/src/screens/root/root.dart

@@ -53,16 +53,16 @@ class RootState extends State<Root> with WidgetsBindingObserver {
 
   @override
   void initState() {
-    WidgetsBinding.instance.addPostFrameCallback((_) async {
-      bool value = await widget.authService.requireAuth();
-      setState(() {
-        _requestAuth = value;
+    WidgetsBinding.instance.addObserver(this);
+
+    widget.authService.requireAuth().then((value) {
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        setState(() => _requestAuth = value);
       });
     });
     _isInactiveController = StreamController<bool>.broadcast();
     _isInactive = false;
     _postFrameCallback = false;
-    WidgetsBinding.instance.addObserver(this);
     super.initState();
     if (DeviceInfo.instance.isMobile) {
       initUniLinks();