opt: hide keyboard when switching login methods

lib/pages/login/view.dart

@@ -456,7 +456,16 @@ class _LoginPageState extends State<LoginPage> {
                 )
               : null,
         ),
-        body: TabBarView(
+        body: NotificationListener(
+          onNotification: (notification) {
+            if (notification is ScrollUpdateNotification) {
+              if (notification.metrics.axis == Axis.horizontal) {
+                FocusScope.of(context).unfocus();
+              }
+            }
+            return true;
+          },
+          child: TabBarView(
             physics: const AlwaysScrollableScrollPhysics(),
             controller: _loginPageCtr.tabController,
             children: [
@@ -465,6 +474,7 @@ class _LoginPageState extends State<LoginPage> {
               tabViewOuter(loginByQRCode()),
             ],
           ),
+        ),
       );
     });
   }
@@ -479,5 +489,4 @@ class _LoginPageState extends State<LoginPage> {
               child: child,
             )));
   }
-
 }