Rename PendingSplice::pending_funding to negotiated_candidates

An upcoming commit will rename PendingSplice to PendingFunding. Thus,
rename the similarly named field to something more meaningful. It
includes FundingScopes that have been negotiated but have not reached
enough confirmations by both parties to have exchanged splice_locked.

Author: jkczyz

lightning/src/ln/channel.rs

@@ -2178,7 +2178,10 @@ impl FundingScope {
 struct PendingSplice {
 	pub our_funding_contribution: i64,
 	funding: Option<FundingScope>,
-	pending_funding: Vec<FundingScope>,
+
+	/// Funding candidates that have been negotiated but have not reached enough confirmations
+	/// by both counterparties to have exchanged `splice_locked` and be promoted.
+	negotiated_candidates: Vec<FundingScope>,
 
 	/// The funding txid used in the `splice_locked` sent to the counterparty.
 	sent_funding_txid: Option<Txid>,
@@ -2195,9 +2198,9 @@ impl PendingSplice {
 	where
 		SP::Target: SignerProvider,
 	{
-		debug_assert!(confirmed_funding_index < self.pending_funding.len());
+		debug_assert!(confirmed_funding_index < self.negotiated_candidates.len());
 
-		let funding = &self.pending_funding[confirmed_funding_index];
+		let funding = &self.negotiated_candidates[confirmed_funding_index];
 		if !context.check_funding_meets_minimum_depth(funding, height) {
 			return None;
 		}
@@ -5999,7 +6002,7 @@ where
 	#[cfg(splicing)]
 	fn pending_funding(&self) -> &[FundingScope] {
 		if let Some(pending_splice) = &self.pending_splice {
-			pending_splice.pending_funding.as_slice()
+			pending_splice.negotiated_candidates.as_slice()
 		} else {
 			&[]
 		}
@@ -7283,7 +7286,7 @@ where
 			for funding in core::iter::once(&mut self.funding).chain(
 				self.pending_splice
 					.as_mut()
-					.map(|pending_splice| pending_splice.pending_funding.as_mut_slice())
+					.map(|pending_splice| pending_splice.negotiated_candidates.as_mut_slice())
 					.unwrap_or(&mut [])
 					.iter_mut(),
 			) {
@@ -7493,7 +7496,7 @@ where
 		for funding in core::iter::once(&mut self.funding).chain(
 			self.pending_splice
 				.as_mut()
-				.map(|pending_splice| pending_splice.pending_funding.as_mut_slice())
+				.map(|pending_splice| pending_splice.negotiated_candidates.as_mut_slice())
 				.unwrap_or(&mut [])
 				.iter_mut(),
 		) {
@@ -9546,7 +9549,7 @@ where
 
 		let pending_splice = self.pending_splice.as_mut().unwrap();
 
-		debug_assert!(confirmed_funding_index < pending_splice.pending_funding.len());
+		debug_assert!(confirmed_funding_index < pending_splice.negotiated_candidates.len());
 
 		let splice_txid = match pending_splice.sent_funding_txid {
 			Some(sent_funding_txid) => sent_funding_txid,
@@ -9564,7 +9567,7 @@ where
 				&self.context.channel_id,
 			);
 
-			let funding = &mut pending_splice.pending_funding[confirmed_funding_index];
+			let funding = &mut pending_splice.negotiated_candidates[confirmed_funding_index];
 			debug_assert_eq!(Some(splice_txid), funding.get_funding_txid());
 			promote_splice_funding!(self, funding);
 
@@ -9639,7 +9642,7 @@ where
 			let mut funding_already_confirmed = false;
 			#[cfg(splicing)]
 			if let Some(pending_splice) = &mut self.pending_splice {
-				for (index, funding) in pending_splice.pending_funding.iter_mut().enumerate() {
+				for (index, funding) in pending_splice.negotiated_candidates.iter_mut().enumerate() {
 					if self.context.check_for_funding_tx_confirmed(
 						funding, block_hash, height, index_in_block, &mut confirmed_tx, logger,
 					)? {
@@ -9674,7 +9677,7 @@ where
 				) {
 					for &(idx, tx) in txdata.iter() {
 						if idx > index_in_block {
-							let funding = &pending_splice.pending_funding[confirmed_funding_index];
+							let funding = &pending_splice.negotiated_candidates[confirmed_funding_index];
 							self.context.check_for_funding_tx_spent(funding, tx, logger)?;
 						}
 					}
@@ -9704,7 +9707,7 @@ where
 			self.context.check_for_funding_tx_spent(&self.funding, tx, logger)?;
 			#[cfg(splicing)]
 			if let Some(pending_splice) = self.pending_splice.as_ref() {
-				for funding in pending_splice.pending_funding.iter() {
+				for funding in pending_splice.negotiated_candidates.iter() {
 					self.context.check_for_funding_tx_spent(funding, tx, logger)?;
 				}
 			}
@@ -9833,7 +9836,7 @@ where
 					return Err(ClosureReason::ProcessingError { err });
 				},
 			};
-			let funding = &mut pending_splice.pending_funding[confirmed_funding_index];
+			let funding = &mut pending_splice.negotiated_candidates[confirmed_funding_index];
 
 			// Check if the splice funding transaction was unconfirmed
 			if funding.get_funding_tx_confirmations(height) == 0 {
@@ -9922,7 +9925,7 @@ where
 				#[cfg(splicing)] {
 					self.pending_splice.as_mut().and_then(|pending_splice| {
 						pending_splice
-							.pending_funding
+							.negotiated_candidates
 							.iter_mut()
 							.find(|funding| funding.get_funding_txid() == Some(*txid))
 					})
@@ -10286,7 +10289,7 @@ where
 		self.pending_splice = Some(PendingSplice {
 			our_funding_contribution: our_funding_contribution_satoshis,
 			funding: None,
-			pending_funding: vec![],
+			negotiated_candidates: vec![],
 			sent_funding_txid: None,
 			received_funding_txid: None,
 		});
@@ -10404,7 +10407,7 @@ where
 		if let Some(sent_funding_txid) = pending_splice.sent_funding_txid {
 			if sent_funding_txid == msg.splice_txid {
 				if let Some(funding) = pending_splice
-					.pending_funding
+					.negotiated_candidates
 					.iter_mut()
 					.find(|funding| funding.get_funding_txid() == Some(sent_funding_txid))
 				{