qml: open invoices list after saving invoice, add invoice to model instead of reloading the whole list

electrum/gui/qml/components/InvoiceDialog.qml

@@ -1,4 +1,4 @@
-import QtQuick 2.6
+import QtQuick 2.12
 import QtQuick.Layouts 1.0
 import QtQuick.Controls 2.14
 import QtQuick.Controls.Material 2.0
@@ -299,6 +299,7 @@ ElDialog {
                 visible: invoice_key == ''
                 enabled: invoice.canSave
                 onClicked: {
+                    app.stack.push(Qt.resolvedUrl('Invoices.qml'))
                     invoice.save_invoice()
                     dialog.close()
                 }