ln invoice dialog: show fallback address

electrum/gui/qt/main_window.py

@@ -1456,16 +1456,21 @@ class ElectrumWindow(QMainWindow, MessageBoxMixin, Logger, QtEventListener):
             grid.addWidget(QLabel(_("Expiration time") + ':'), 4, 0)
             grid.addWidget(QLabel(format_time(invoice.time + invoice.exp)), 4, 1)
         grid.addWidget(QLabel(_('Features') + ':'), 5, 0)
-        grid.addWidget(QLabel('\n'.join(lnaddr.get_features().get_names())), 5, 1)
+        grid.addWidget(QLabel(', '.join(lnaddr.get_features().get_names())), 5, 1)
         payhash_e = ShowQRLineEdit(lnaddr.paymenthash.hex(), self.config, title=_("Payment Hash"))
         grid.addWidget(QLabel(_("Payment Hash") + ':'), 6, 0)
         grid.addWidget(payhash_e, 6, 1)
+        fallback = lnaddr.get_fallback_address()
+        if fallback:
+            fallback_e = ShowQRLineEdit(fallback, self.config, title=_("Fallback address"))
+            grid.addWidget(QLabel(_("Fallback address") + ':'), 7, 0)
+            grid.addWidget(fallback_e, 7, 1)
         invoice_e = ShowQRTextEdit(config=self.config)
         invoice_e.setFont(QFont(MONOSPACE_FONT))
         invoice_e.addCopyButton()
         invoice_e.setText(invoice.lightning_invoice)
-        grid.addWidget(QLabel(_('Text') + ':'), 7, 0)
-        grid.addWidget(invoice_e, 7, 1)
+        grid.addWidget(QLabel(_('Text') + ':'), 8, 0)
+        grid.addWidget(invoice_e, 8, 1)
         vbox.addLayout(grid)
         vbox.addLayout(Buttons(CloseButton(d),))
         d.exec_()