Make sign in screen flow cleaner on logins.

lib/screens/sign_in.dart

@@ -47,6 +47,28 @@ class _SignInScreenState extends State<SignInScreen> {
     } else {
       newProfile();
     }
+    usernameController.addListener(() {
+      _updateSignInButtonStatus();
+    });
+    passwordController.addListener(() {
+      _updateSignInButtonStatus();
+    });
+    serverNameController.addListener(() {
+      _updateSignInButtonStatus();
+    });
+  }
+
+  void _updateSignInButtonStatus() {
+    setState(() {
+      signInButtonEnabled = switch (oauthType) {
+        usernamePasswordType =>
+        serverNameController.text.isNotEmpty &&
+            usernameController.text.isNotEmpty &&
+            passwordController.text.isNotEmpty,
+        oauthType => serverNameController.text.isNotEmpty,
+        _ => false,
+      };
+    });
   }
 
   void newProfile() {
@@ -54,7 +76,7 @@ class _SignInScreenState extends State<SignInScreen> {
     passwordController.clear();
     serverNameController.clear();
     authType = oauthType;
-    signInButtonEnabled = true;
+    signInButtonEnabled = false;
     existingProfile = null;
   }
 
@@ -152,7 +174,10 @@ class _SignInScreenState extends State<SignInScreen> {
                     hintText: 'Server Name (friendica.example.com)',
                     border: OutlineInputBorder(
                       borderSide: BorderSide(
-                        color: Theme.of(context).colorScheme.background,
+                        color: Theme
+                            .of(context)
+                            .colorScheme
+                            .background,
                       ),
                       borderRadius: BorderRadius.circular(5.0),
                     ),
@@ -163,7 +188,8 @@ class _SignInScreenState extends State<SignInScreen> {
                 if (!showUsernameAndPasswordFields) ...[
                   Text(
                     existingAccount
-                        ? 'Configured to sign in as user ${existingProfile?.handle}'
+                        ? 'Configured to sign in as user ${existingProfile
+                        ?.handle}'
                         : 'Relatica will open the requested Friendica site in a web browser where you will be asked to authorize this client.',
                     softWrap: true,
                   ),
@@ -195,7 +221,10 @@ class _SignInScreenState extends State<SignInScreen> {
                       hintText: 'Username (user@example.com)',
                       border: OutlineInputBorder(
                         borderSide: BorderSide(
-                          color: Theme.of(context).colorScheme.background,
+                          color: Theme
+                              .of(context)
+                              .colorScheme
+                              .background,
                         ),
                         borderRadius: BorderRadius.circular(5.0),
                       ),
@@ -229,7 +258,10 @@ class _SignInScreenState extends State<SignInScreen> {
                       hintText: 'Password',
                       border: OutlineInputBorder(
                         borderSide: BorderSide(
-                          color: Theme.of(context).colorScheme.background,
+                          color: Theme
+                              .of(context)
+                              .colorScheme
+                              .background,
                         ),
                         borderRadius: BorderRadius.circular(5.0),
                       ),
@@ -240,14 +272,17 @@ class _SignInScreenState extends State<SignInScreen> {
                 ],
                 signInButtonEnabled
                     ? ElevatedButton(
-                        onPressed: () => _signIn(context),
+                  onPressed: () async => await _signIn(context),
                   child: const Text('Signin'),
                 )
                     : SizedBox(),
                 const VerticalPadding(),
                 Text(
                   'Logged out:',
-                  style: Theme.of(context).textTheme.headlineSmall,
+                  style: Theme
+                      .of(context)
+                      .textTheme
+                      .headlineSmall,
                 ),
                 loggedOutProfiles.isEmpty
                     ? const Text(
@@ -289,7 +324,10 @@ class _SignInScreenState extends State<SignInScreen> {
                 const VerticalPadding(),
                 Text(
                   'Logged in:',
-                  style: Theme.of(context).textTheme.headlineSmall,
+                  style: Theme
+                      .of(context)
+                      .textTheme
+                      .headlineSmall,
                 ),
                 loggedInProfiles.isEmpty
                     ? const Text(
@@ -353,7 +391,7 @@ class _SignInScreenState extends State<SignInScreen> {
     );
   }
 
-  void _signIn(BuildContext context) async {
+  Future<void> _signIn(BuildContext context) async {
     final valid = formKey.currentState?.validate() ?? false;
     if (!valid) {
       buildSnackbar(
@@ -385,13 +423,19 @@ class _SignInScreenState extends State<SignInScreen> {
       return;
     }
 
-    print('Sign in credentials: ${creds.toJson()}');
-
-    final result = await getIt<AccountsService>().signIn(creds);
+    buildSnackbar(context, 'Attempting to sign in account...');
+    final result = await getIt<AccountsService>().signIn(
+      creds,
+      withNotification: false,
+    );
     if (mounted && result.isFailure) {
       buildSnackbar(context, 'Error signing in: ${result.error}');
       return;
     }
+
+    if (mounted) {
+      buildSnackbar(context, 'Account signed in...');
+    }
     await getIt<AccountsService>().setActiveProfile(result.value);
     if (mounted) {
       context.goNamed(ScreenPaths.timelines);