From 8d61bae1f1ffd96f7d70751ba8d0369d6906f2fd Mon Sep 17 00:00:00 2001
From: "R. Timothy Edwards" <tim@opencircuitdesign.com>
Date: Mon, 8 Jun 2026 19:33:07 -0400
Subject: [PATCH] Corrected the "extresist" node merge routine to not merge
 away the ResNodeAtOrigin node, but to instead move it to the remaining valid
 node.

---
 resis/ResMerge.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/resis/ResMerge.c b/resis/ResMerge.c
index 3e4b4dec..cc727179 100644
--- a/resis/ResMerge.c
+++ b/resis/ResMerge.c
@@ -995,6 +995,9 @@ ResMergeNodes(node1, node2, pendingList, doneList)
 	node2->rn_client = (ClientData)NULL;
     }
 
+    /* Don't merge away the ResNodeAtOrigin node */
+    if (ResNodeAtOrigin == node2) ResNodeAtOrigin = node1;
+
     node2->rn_re = (resElement *)CLIENTDEFAULT;
     node2->rn_ce = (cElement   *)CLIENTDEFAULT;
     node2->rn_je = (jElement   *)CLIENTDEFAULT;