fix: Dont rerun server checks

lib/pages/homeserver_picker/homeserver_picker.dart

@@ -103,13 +103,15 @@ class HomeserverPickerController extends State<HomeserverPicker> {
     _intentDataStreamSubscription?.cancel();
   }
 
+  String _lastCheckedHomeserver;
+
   /// Starts an analysis of the given homeserver. It uses the current domain and
   /// makes sure that it is prefixed with https. Then it searches for the
   /// well-known information and forwards to the login page depending on the
   /// login type.
   Future<void> checkHomeserverAction() async {
     _coolDown?.cancel();
-    try {
+    if (_lastCheckedHomeserver == domain) return;
     if (domain.isEmpty) throw L10n.of(context).changeTheHomeserver;
     var homeserver = domain;
 
@@ -121,6 +123,8 @@ class HomeserverPickerController extends State<HomeserverPicker> {
       error = _rawLoginTypes = registrationSupported = null;
       isLoading = true;
     });
+
+    try {
       final wellKnown =
           await Matrix.of(context).getLoginClient().checkHomeserver(homeserver);
 
@@ -151,6 +155,7 @@ class HomeserverPickerController extends State<HomeserverPicker> {
     } catch (e) {
       setState(() => error = (e as Object).toLocalizedString(context));
     } finally {
+      _lastCheckedHomeserver = domain;
       if (mounted) {
         setState(() => isLoading = false);
       }