submarine swaps: improve labels

- claim tx was incorrectly labeled
 - if we send tx change to a swap, display both labels

electrum/lnworker.py

@@ -1044,10 +1044,8 @@ class LNWallet(LNWorker):
             if swap:
                 if swap.is_reverse:
                     item['group_id'] = swap.spending_txid
-                    item['group_label'] = 'Reverse swap' + ' ' + self.config.format_amount_and_units(swap.lightning_amount)
                 else:
                     item['group_id'] = swap.funding_txid
-                    item['group_label'] = 'Forward swap' + ' ' + self.config.format_amount_and_units(swap.onchain_amount)
             # done
             out[payment_hash] = item
         return out
@@ -1119,7 +1117,14 @@ class LNWallet(LNWorker):
                 direction, amount_msat, fee_msat, timestamp = self.get_payment_value(info, plist)
             else:
                 amount_msat = 0
-            label = 'Reverse swap' if swap.is_reverse else 'Forward swap'
+
+            if swap.is_reverse:
+                group_label = 'Reverse swap' + ' ' + self.config.format_amount_and_units(swap.lightning_amount)
+            else:
+                group_label = 'Forward swap' + ' ' + self.config.format_amount_and_units(swap.onchain_amount)
+            self._labels_cache[txid] = group_label
+
+            label = _('Claim transaction') if swap.is_reverse else _('Funding transaction')
             delta = current_height - swap.locktime
             if self.wallet.adb.is_mine(swap.lockup_address):
                 tx_height = self.wallet.adb.get_tx_height(swap.funding_txid)
@@ -1127,12 +1132,11 @@ class LNWallet(LNWorker):
                     label += ' (%s)' % _('waiting for funding tx confirmation')
                 if not swap.is_reverse and not swap.is_redeemed and swap.spending_txid is None and delta < 0:
                     label += f' (refundable in {-delta} blocks)' # fixme: only if unspent
-            self._labels_cache[txid] = label
             out[txid] = {
                 'group_id': txid,
                 'amount_msat': 0, # must be zero for onchain tx
                 'type': 'swap',
-                'label': _('Funding transaction'),
+                'label': label,
             }
             if not swap.is_reverse:
                 # if the spending_tx is in the wallet, this will add it

electrum/wallet.py

@@ -1292,9 +1292,10 @@ class Abstract_Wallet(ABC, Logger, EventListener):
             else:
                 key = 'group:' + group_id
                 parent = transactions.get(key)
+                label = self.get_label_for_txid(group_id)
                 if parent is None:
                     parent = {
-                        'label': tx_item.get('group_label'),
+                        'label': label,
                         'fiat_value': Fiat(Decimal(0), fx.ccy) if fx else None,
                         'bc_value': Satoshis(0),
                         'ln_value': Satoshis(0),
@@ -1527,24 +1528,22 @@ class Abstract_Wallet(ABC, Logger, EventListener):
         return self._labels.get(tx_hash) or self._get_default_label_for_txid(tx_hash)
 
     def _get_default_label_for_txid(self, tx_hash: str) -> str:
-        if self.lnworker and (label:= self.lnworker.get_label_for_txid(tx_hash)):
-            return label
+        labels = []
         # note: we don't deserialize tx as the history calls us for every tx, and that would be slow
         if not self.db.get_txi_addresses(tx_hash):
             # no inputs are ismine -> likely incoming payment -> concat labels of output addresses
-            labels = []
             for addr in self.db.get_txo_addresses(tx_hash):
                 label = self.get_label_for_address(addr)
                 if label:
                     labels.append(label)
-            return ', '.join(labels)
         else:
             # some inputs are ismine -> likely outgoing payment
-            labels = []
             for invoice in self.get_relevant_invoices_for_tx(tx_hash):
                 if invoice.message:
                     labels.append(invoice.message)
-            return ', '.join(labels)
+        if not labels and self.lnworker and (label:= self.lnworker.get_label_for_txid(tx_hash)):
+            labels.append(label)
+        return ', '.join(labels)
 
     def _get_default_label_for_rhash(self, rhash: str) -> str:
         req = self.get_request(rhash)