qml: keep lnurlData even after bolt11 has been retrieved, add isLnurlPay property and save bolt11 before triggering pay

electrum/gui/qml/components/InvoiceDialog.qml

@@ -456,10 +456,14 @@ ElDialog {
         } else if (invoice.amount.isMax) {
             amountMax.checked = true
         }
-        if (invoice.lnurlData) {
+        if (invoice.isLnurlPay) {
             // we arrive from a lnurl-pay confirm dialog where the user already indicated the intent to pay.
-            if (invoice.canPay)
+            if (invoice.canPay) {
+                if (invoice_key == '') {
+                    invoice.save_invoice()
+                }
                 doPay()
+            }
         }
     }
 }

electrum/gui/qml/qeinvoice.py

@@ -203,10 +203,8 @@ class QEInvoiceParser(QEInvoice, QtEventListener):
 
     @recipient.setter
     def recipient(self, recipient: str):
-        #if self._recipient != recipient:
         self.canPay = False
         self._recipient = recipient
-        self._lnurlData = None
         self.amountOverride = QEAmount()
         if recipient:
             self.validateRecipient(recipient)
@@ -216,6 +214,10 @@ class QEInvoiceParser(QEInvoice, QtEventListener):
     def lnurlData(self):
         return self._lnurlData
 
+    @pyqtProperty(bool, notify=lnurlRetrieved)
+    def isLnurlPay(self):
+        return not self._lnurlData is None
+
     @pyqtProperty(str, notify=invoiceChanged)
     def message(self):
         return self._effectiveInvoice.message if self._effectiveInvoice else ''