trampoline: when sending payment, log "is_legacy" (e2e vs pay2legacy)

Author: SomberNight

electrum/lnworker.py

@@ -3716,7 +3716,7 @@ def create_onion_for_route(
             total_msat=total_msat,
             payment_secret=payment_secret)
         num_hops = len(hops_data)
-        self.logger.info(f"pay len(route)={len(route)}")
+        self.logger.info(f"pay len(route)={len(route)}. for payment_hash={payment_hash.hex()}")
         for i in range(len(route)):
             self.logger.info(f"  {i}: edge={route[i].short_channel_id} hop_data={hops_data[i]!r}")
         assert final_cltv_abs <= cltv_abs, (final_cltv_abs, cltv_abs)

electrum/trampoline.py

@@ -222,6 +222,7 @@ def create_trampoline_route(
 ) -> LNPaymentTRoute:
     # we decide whether to convert to a legacy payment
     is_legacy, invoice_trampolines = is_legacy_relay(invoice_features, r_tags)
+    _logger.debug(f"Creating trampoline route for invoice_pubkey={invoice_pubkey.hex()}, {is_legacy=}")
 
     # we build a route of trampoline hops and extend the route list in place
     route = []