From 76e58a2b05db35e051e3b6cefa4d3c63ad0dc509 Mon Sep 17 00:00:00 2001
From: Guido van Rossum <guido@python.org>
Date: Tue, 3 Dec 2002 21:30:28 +0000
Subject: [PATCH] Fix a bug in unindexing removed messages (it was iterating
 over a lazy list that was being modified as we went). [Backport from Zope3;
 I'm not actually sure if the list returned by **Btree.keys() is lazy, but I
 assume it is.]

---
 tests/mhindex.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tests/mhindex.py b/tests/mhindex.py
index 4be25ee..a21be7a 100644
--- a/tests/mhindex.py
+++ b/tests/mhindex.py
@@ -468,7 +468,7 @@ def updatefolder(self, f, msgs):
             self.index.index_text(docid, text)
             self.maycommit()
         # Remove messages from the folder that no longer exist
-        for path in self.path2docid.keys(f.name):
+        for path in list(self.path2docid.keys(f.name)):
             if not path.startswith(f.name + "/"):
                 break
             if self.getmtime(path) == 0: