plugins/pay: hand bolt11 arg to sendonion if we have one (i.e. for `pay`)

[ Extracted into standalone patch and comment added by RR ]

plugins/libplugin-pay.c

@@ -28,6 +28,7 @@ struct payment *payment_new(tal_t *ctx, struct command *cmd,
 	p->route = NULL;
 	p->temp_exclusion = NULL;
 	p->failroute_retry = false;
+	p->bolt11 = NULL;
 
 	/* Copy over the relevant pieces of information. */
 	if (parent != NULL) {
@@ -1040,6 +1041,9 @@ static struct command_result *payment_createonion_success(struct command *cmd,
 	if (p->label)
 		json_add_string(req->js, "label", p->label);
 
+	if (p->bolt11)
+		json_add_string(req->js, "bolt11", p->bolt11);
+
 	send_outreq(p->plugin, req);
 	return command_still_pending(cmd);
 }

tests/test_pay.py

@@ -3195,7 +3195,6 @@ def test_pay_fail_unconfirmed_channel(node_factory, bitcoind):
     l1.rpc.pay(invl2)
 
 
-@pytest.mark.xfail(strict=True)    
 def test_bolt11_null_after_pay(node_factory, bitcoind):
     l1, l2 = node_factory.get_nodes(2)