follow-up invoice changes: fix qt lightning_tx_dialog

follow-up 719b468eee

Traceback (most recent call last):
  File "...\electrum\electrum\gui\qt\history_list.py", line 673, in mouseDoubleClickEvent
    self.parent.show_lightning_transaction(tx_item)
  File "...\electrum\electrum\gui\qt\main_window.py", line 1082, in show_lightning_transaction
    d = LightningTxDialog(self, tx_item)
  File "...\electrum\electrum\gui\qt\lightning_tx_dialog.py", line 60, in __init__
    self.invoice = invoice.lightning_invoice
AttributeError: 'Request' object has no attribute 'lightning_invoice'

electrum/gui/qt/lightning_tx_dialog.py

@@ -32,6 +32,7 @@ from PyQt5.QtWidgets import QVBoxLayout, QLabel, QGridLayout
 
 from electrum.i18n import _
 from electrum.lnworker import PaymentDirection
+from electrum.invoices import Invoice
 
 from .util import WindowModalDialog, ShowQRLineEdit, ColorScheme, Buttons, CloseButton, font_height
 from .qrtextedit import ShowQRTextEdit
@@ -53,13 +54,11 @@ class LightningTxDialog(WindowModalDialog):
         self.amount = Decimal(tx_item['amount_msat']) / 1000
         self.payment_hash = tx_item['payment_hash']
         self.preimage = tx_item['preimage']
-        invoice = (self.parent.wallet.get_invoice(self.payment_hash)
-                   or self.parent.wallet.get_request(self.payment_hash))
+        self.invoice = ""
+        invoice = self.parent.wallet.get_invoice(self.payment_hash)  # only check outgoing invoices
         if invoice:
             assert invoice.is_lightning(), f"{self.invoice!r}"
             self.invoice = invoice.lightning_invoice
-        else:
-            self.invoice = ''
         self.setMinimumWidth(700)
         vbox = QVBoxLayout()
         self.setLayout(vbox)
@@ -78,6 +77,7 @@ class LightningTxDialog(WindowModalDialog):
         vbox.addWidget(QLabel(_("Preimage") + ":"))
         self.preimage_e = ShowQRLineEdit(self.preimage, self.config, title=_("Preimage"))
         vbox.addWidget(self.preimage_e)
+        if self.invoice:
             vbox.addWidget(QLabel(_("Lightning Invoice") + ":"))
             self.invoice_e = ShowQRTextEdit(self.invoice, config=self.config)
             self.invoice_e.setMaximumHeight(max(150, 10 * font_height()))