neon: Required setting scheme for login

packages/neon/neon/lib/src/pages/login.dart

@@ -200,18 +200,10 @@ class _LoginPageState extends State<LoginPage> {
                                 ),
                                 keyboardType: TextInputType.url,
                                 initialValue: widget.serverURL,
-                                validator: (final input) => validateHttpUrl(
+                                validator: (final input) => validateHttpUrl(context, input),
-                                  context,
-                                  input,
-                                  allowEmptyScheme: true,
-                                ),
                                 onFieldSubmitted: (final input) {
                                   if (_formKey.currentState!.validate()) {
-                                    var url = input;
+                                    _loginBloc.setServerURL(input);
-                                    if (!(url.startsWith('http://') || url.startsWith('https://'))) {
-                                      url = 'http://$url';
-                                    }
-                                    _loginBloc.setServerURL(url);
                                   } else {
                                     _focusNode.requestFocus();
                                   }

packages/neon/neon/lib/src/utils/validators.dart

@@ -4,7 +4,6 @@ String? validateHttpUrl(
   final BuildContext context,
   final String? input, {
   final bool httpsOnly = false,
-  final bool allowEmptyScheme = false,
 }) {
   if (input == null || input == '') {
     return AppLocalizations.of(context).errorInvalidURL;
@@ -15,9 +14,7 @@ String? validateHttpUrl(
       return null;
     }
     if (uri.isScheme('http') && !httpsOnly) {
-      return null;
+      // TODO: Maybe make a better error message for http URLs if only https is allowed
-    }
-    if (uri.isScheme('') && allowEmptyScheme) {
       return null;
     }
   } catch (_) {}