Exit quiescence when splice_init is rejected with Abort

The same bug fixed in the prior commit for tx_init_rbf also exists in
internal_splice_init: when splice_init triggers FeeRateTooHigh in
resolve_queued_contribution, the ChannelError::Abort goes through
try_channel_entry! without exiting quiescence.

Apply the same fix: intercept ChannelError::Abort before
try_channel_entry!, call exit_quiescence, and return the error with
exited_quiescence set.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: jkczyz

lightning/src/ln/channelmanager.rs

@@ -13073,6 +13073,15 @@ This indicates a bug inside LDK. Please report this error at https://github.com/
 						&self.get_our_node_id(),
 						&self.logger,
 					);
+					if let Err(ChannelError::Abort(_)) = &init_res {
+						funded_channel.exit_quiescence();
+						let chan_id = funded_channel.context.channel_id();
+						let res = MsgHandleErrInternal::from_chan_no_close(
+							init_res.unwrap_err(),
+							chan_id,
+						);
+						return Err(res.with_exited_quiescence(true));
+					}
 					let splice_ack_msg = try_channel_entry!(self, peer_state, init_res, chan_entry);
 					peer_state.pending_msg_events.push(MessageSendEvent::SendSpliceAck {
 						node_id: *counterparty_node_id,

lightning/src/ln/splicing_tests.rs

@@ -1814,10 +1814,25 @@ fn test_splice_tiebreak_feerate_too_high_rejected() {
 	let splice_init = get_event_msg!(nodes[0], MessageSendEvent::SendSpliceInit, node_id_1);
 
 	// Node 1 handles SpliceInit — TooHigh: target (100k) >> max (3k) and fair fee > budget.
+	// Node 1 exits quiescence upon rejecting with tx_abort, and since it has a pending
+	// QuiescentAction (from its own splice attempt), it immediately re-proposes quiescence.
 	nodes[1].node.handle_splice_init(node_id_0, &splice_init);
 
-	let tx_abort = get_event_msg!(nodes[1], MessageSendEvent::SendTxAbort, node_id_0);
-	assert_eq!(tx_abort.channel_id, channel_id);
+	let msg_events = nodes[1].node.get_and_clear_pending_msg_events();
+	assert_eq!(msg_events.len(), 2);
+	match &msg_events[0] {
+		MessageSendEvent::SendTxAbort { node_id, msg } => {
+			assert_eq!(*node_id, node_id_0);
+			assert_eq!(msg.channel_id, channel_id);
+		},
+		_ => panic!("Expected SendTxAbort, got {:?}", msg_events[0]),
+	};
+	match &msg_events[1] {
+		MessageSendEvent::SendStfu { node_id, .. } => {
+			assert_eq!(*node_id, node_id_0);
+		},
+		_ => panic!("Expected SendStfu, got {:?}", msg_events[1]),
+	};
 }
 
 #[cfg(test)]