qt history: fixes for tx context-menu "View invoice" if more than one

fixes #6516

coalesce "View invoice" options into submenu if there are multiple;
also make sure lambda uses bound argument

electrum/gui/qt/history_list.py

@@ -675,7 +675,6 @@ class HistoryList(MyTreeView, AcceptFileDragDrop):
         tx_URL = block_explorer_URL(self.config, 'tx', tx_hash)
         tx_details = self.wallet.get_tx_info(tx)
         is_unconfirmed = tx_details.tx_mined_status.height <= 0
-        invoice_keys = self.wallet.get_relevant_invoice_keys_for_tx(tx)
         menu = QMenu()
         if tx_details.can_remove:
             menu.addAction(_("Remove"), lambda: self.remove_local_tx(tx_hash))
@@ -699,10 +698,13 @@ class HistoryList(MyTreeView, AcceptFileDragDrop):
                 child_tx = self.wallet.cpfp(tx, 0)
                 if child_tx:
                     menu.addAction(_("Child pays for parent"), lambda: self.parent.cpfp(tx, child_tx))
-        for key in invoice_keys:
-            invoice = self.parent.wallet.get_invoice(key)
-            if invoice:
-                menu.addAction(_("View invoice"), lambda: self.parent.show_onchain_invoice(invoice))
+        invoices = self.wallet.get_relevant_invoices_for_tx(tx)
+        if len(invoices) == 1:
+            menu.addAction(_("View invoice"), lambda inv=invoices[0]: self.parent.show_onchain_invoice(inv))
+        elif len(invoices) > 1:
+            menu_invs = menu.addMenu(_("Related invoices"))
+            for inv in invoices:
+                menu_invs.addAction(_("View invoice"), lambda inv=inv: self.parent.show_onchain_invoice(inv))
         if tx_URL:
             menu.addAction(_("View on block explorer"), lambda: webopen(tx_URL))
         menu.exec_(self.viewport().mapToGlobal(position))

electrum/wallet.py

@@ -764,7 +764,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
     def export_invoices(self, path):
         write_json_file(path, list(self.invoices.values()))
 
-    def get_relevant_invoice_keys_for_tx(self, tx: Transaction) -> Set[str]:
+    def _get_relevant_invoice_keys_for_tx(self, tx: Transaction) -> Set[str]:
         relevant_invoice_keys = set()
         for txout in tx.outputs():
             for invoice_key in self._invoices_from_scriptpubkey_map.get(txout.scriptpubkey, set()):
@@ -773,6 +773,14 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
                     relevant_invoice_keys.add(invoice_key)
         return relevant_invoice_keys
 
+    def get_relevant_invoices_for_tx(self, tx: Transaction) -> Sequence[OnchainInvoice]:
+        invoice_keys = self._get_relevant_invoice_keys_for_tx(tx)
+        invoices = [self.get_invoice(key) for key in invoice_keys]
+        invoices = [inv for inv in invoices if inv]  # filter out None
+        for inv in invoices:
+            assert isinstance(inv, OnchainInvoice), f"unexpected type {type(inv)}"
+        return invoices
+
     def _prepare_onchain_invoice_paid_detection(self):
         # scriptpubkey -> list(invoice_keys)
         self._invoices_from_scriptpubkey_map = defaultdict(set)  # type: Dict[bytes, Set[str]]
@@ -811,10 +819,7 @@ class Abstract_Wallet(AddressSynchronizer, ABC):
         tx_hash = tx.txid()
         with self.transaction_lock:
             labels = []
-            for invoice_key in self.get_relevant_invoice_keys_for_tx(tx):
-                invoice = self.invoices.get(invoice_key)
-                if invoice is None: continue
-                assert isinstance(invoice, OnchainInvoice)
+            for invoice in self.get_relevant_invoices_for_tx(tx):
                 if invoice.message:
                     labels.append(invoice.message)
         if labels: