Coin selection with small amounts fix (#2144)

* coin selection fix for sending with an amount <= smallest output

* rustfmt

wallet/src/adapters/http.rs

@@ -48,8 +48,9 @@ impl WalletCommAdapter for HTTPWalletCommAdapter {
 		let url = format!("{}/v1/wallet/foreign/receive_tx", dest);
 		debug!("Posting transaction slate to {}", url);
 
-		let res = api::client::post(url.as_str(), None, slate)
-			.context(ErrorKind::ClientCallback("Posting transaction slate"))?;
+		let res = api::client::post(url.as_str(), None, slate).context(
+			ErrorKind::ClientCallback("Posting transaction slate (is recipient listening?)"),
+		)?;
 		Ok(res)
 	}
 

wallet/src/libwallet/internal/selection.rs

@@ -235,7 +235,7 @@ where
 	K: Keychain,
 {
 	// select some spendable coins from the wallet
-	let (max_outputs, coins) = select_coins(
+	let (max_outputs, mut coins) = select_coins(
 		wallet,
 		amount,
 		current_height,
@@ -291,7 +291,7 @@ where
 			}
 
 			// select some spendable coins from the wallet
-			let (_, coins) = select_coins(
+			coins = select_coins(
 				wallet,
 				amount_with_fee,
 				current_height,
@@ -299,7 +299,8 @@ where
 				max_outputs,
 				selection_strategy_is_use_all,
 				parent_key_id,
-			);
+			)
+			.1;
 			fee = tx_fee(coins.len(), num_outputs, 1, None);
 			total = coins.iter().map(|c| c.value).sum();
 			amount_with_fee = amount + fee;