From 4fd3089cfce161de5356b6fe03ddbaa19069f371 Mon Sep 17 00:00:00 2001
From: Tim Edwards <tim@opencircuitdesign.com>
Date: Thu, 19 Apr 2018 16:14:17 -0400
Subject: [PATCH] Corrected an error in which the selection definition may
 contain invalid pointers to a cell that was deleted while it was selected.
 Solution is to clear selections before deleting a cell.

---
 commands/CmdCD.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/commands/CmdCD.c b/commands/CmdCD.c
index e4c03a85..0866cef5 100644
--- a/commands/CmdCD.c
+++ b/commands/CmdCD.c
@@ -741,11 +741,19 @@ CmdCellname(w, cmd)
 
 	case IDX_DELETE:
 	    /* Unload the cell definition and free memory */
+	    /* Make sure selections are cleared or they may	*/
+	    /* contain references to the deleted cell def.	*/
 	    if ((locargc == 4) && !strcmp(cmd->tx_argv[3 + ((dolist) ? 1 : 0)],
 			"-noprompt"))
+	    {
+		SelectClear();
 	        DBCellDelete(cellname, TRUE);
+	    }
 	    else if (locargc == 3)
+	    {
+		SelectClear();
 	        DBCellDelete(cellname, FALSE);
+	    }
 	    else 
 		TxError("Delete cell command missing cellname\n");
 	    break;