Prevent double send actions in SendPage (#2542)

lib/src/screens/send/send_page.dart

@@ -64,6 +64,7 @@ class SendPage extends BasePage {
   final PaymentRequest? initialPaymentRequest;
 
   bool _effectsInstalled = false;
+  bool _sendInProgress = false;
   ContactRecord? newContactAddress;
 
   @override
@@ -412,6 +413,9 @@ class SendPage extends BasePage {
                           return LoadingPrimaryButton(
                             key: ValueKey('send_page_send_button_key'),
                             onPressed: () async {
+                              // Prevent double taps
+                              if (_sendInProgress) return;
+
                               //Request dummy node to get the focus out of the text fields
                               FocusScope.of(context).requestFocus(FocusNode());
 
@@ -467,6 +471,8 @@ class SendPage extends BasePage {
                                 }
                               }
 
+                              _sendInProgress = true;
+
                               final check = sendViewModel.shouldDisplayTotp();
                               authService.authenticateAction(
                                 context,
@@ -474,6 +480,8 @@ class SendPage extends BasePage {
                                 onAuthSuccess: (value) async {
                                   if (value) {
                                     await sendViewModel.createTransaction();
+                                  } else {
+                                    _sendInProgress = false;
                                   }
                                 },
                               );
@@ -522,6 +530,7 @@ class SendPage extends BasePage {
       }
 
       if (state is FailureState) {
+        _sendInProgress = false;
         WidgetsBinding.instance.addPostFrameCallback(
           (_) {
             showPopUp<void>(
@@ -602,11 +611,13 @@ class SendPage extends BasePage {
             );
 
             if (result == null) sendViewModel.dismissTransaction();
+            _sendInProgress = false;
           }
         });
       }
 
       if (state is TransactionCommitted) {
+        _sendInProgress = false;
         WidgetsBinding.instance.addPostFrameCallback((_) async {
           if (!context.mounted) {
             return;