From f051f12b939e61e5d374f94e7cbef850a342c7e7 Mon Sep 17 00:00:00 2001
From: wucas <git@wucas.de>
Date: Mon, 10 Dec 2018 11:08:06 +0100
Subject: [PATCH] Added a comment int the backtrack code to explain the
 commented code.

---
 lib/stbcbckt.gi | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/stbcbckt.gi b/lib/stbcbckt.gi
index 12c2bad79d..f49914a22a 100644
--- a/lib/stbcbckt.gi
+++ b/lib/stbcbckt.gi
@@ -1327,6 +1327,9 @@ InstallGlobalFunction( PartitionBacktrack,
                     image.level := rbase.lev[ d ];
                     if IsSlicedPerm( image.perm )  then
                         image.perm!.length := oldprm;
+                         # Here and below the code that refers to `rgtObj` was used to avoid multiplication
+                         # of permutations. It has been commented out for a long time, but accidentally remained
+                         # documented in `doc/ref/stbchain.xml` until its withdrawal in 2018.
 #                        image.perm!.rgtObj := oldrgt;
                     else
                         image.perm := oldprm;