From 5f0ddfd95053689c6c9b8e555f48fffdb2ad787b Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@pond.sub.org>
Date: Thu, 10 May 2018 10:16:10 +0200
Subject: [PATCH] set: Use the first unused lot instead of the last

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>
---
 src/lib/commands/set.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/lib/commands/set.c b/src/lib/commands/set.c
index 751f2f81..22547049 100644
--- a/src/lib/commands/set.c
+++ b/src/lib/commands/set.c
@@ -30,6 +30,7 @@
  *     Dave Pare, 1986
  *     Pat Loney, 1992
  *     Steve McClure, 1996
+ *     Markus Armbruster, 2004-2018
  */
 
 #include <config.h>
@@ -101,8 +102,10 @@ set(void)
 	freeslot = -1;
 	snxtitem_all(&ni_trade, EF_TRADE);
 	while (nxtitem(&ni_trade, &trade)) {
-	    if (trade.trd_owner == 0)
-		freeslot = ni_trade.cur;
+	    if (!trade.trd_owner) {
+		if (freeslot < 0)
+		    freeslot = ni_trade.cur;
+	    }
 	    if (trade.trd_unitid == ni.cur && trade.trd_type == type) {
 		foundslot = ni_trade.cur;
 		break;