Bank transfer: Hide email form if email was already sent (Z#23128941) (#3570)

Co-authored-by: Mira <weller@rami.io>

src/pretix/plugins/banktransfer/payment.py

@@ -530,6 +530,7 @@ class BankTransfer(BasePaymentProvider):
             'code': self._code(payment.order),
             'order': payment.order,
             'amount': payment.amount,
+            'payment_info': payment.info_data,
             'settings': self.settings,
             'swiss_qrbill': self.swiss_qrbill(payment),
             'eu_barcodes': self.event.currency == 'EUR',

src/pretix/plugins/banktransfer/templates/pretixplugins/banktransfer/pending.html

@@ -106,7 +106,20 @@ SCT
 {% endif %}
 
 {% if invoice_email_enabled and has_invoices %}
-    <form method="post" action="{% eventurl event "plugins:banktransfer:mail_invoice" order=order.code secret=order.secret %}">
+    {% if payment_info.send_invoice_to %}
+        <p>
+            {% blocktrans trimmed with recipient=payment_info.send_invoice_to %}
+                At your request, we sent the invoice directly to {{ recipient }}.
+            {% endblocktrans %}
+            <a data-toggle="collapse" data-target="#payment_banktransfer_send_invoice_to" class="btn btn-default btn-xs">
+                <span class="fa fa-envelope-o"></span>
+                {% trans "Send again or somewhere else" %}
+            </a>
+        </p>
+    {% endif %}
+    <form id="payment_banktransfer_send_invoice_to" method="post"
+          action="{% eventurl event "plugins:banktransfer:mail_invoice" order=order.code secret=order.secret %}"
+          {% if payment_info.send_invoice_to %}class="collapse"{% endif %}>
         {% csrf_token %}
         <p>
             {% blocktrans trimmed %}

src/pretix/plugins/banktransfer/views.py

@@ -923,5 +923,11 @@ class SendInvoiceMailView(EventViewMixin, OrderDetailMixin, View):
         provider = last_payment.payment_provider
         provider.send_invoice_to_alternate_email(self.order, last_invoice, request.POST['email'])
 
+        last_payment.info_data = {
+            **last_payment.info_data,
+            'send_invoice_to': request.POST['email'],
+        }
+        last_payment.save(update_fields=['info'])
+
         messages.success(request, _('Sending the latest invoice via e-mail to {email}.').format(email=request.POST['email']))
         return redirect(self.get_order_url())