[Bug #1569790] mailbox.Maildir.get_folder() loses factory information
Both the Maildir and MH classes had this bug; the patch fixes both classes
and adds a test.
diff --git a/Misc/NEWS b/Misc/NEWS
index 6753554..8e258a4 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -133,6 +133,10 @@
- Bug #1565661: in webbrowser, split() the command for the default
GNOME browser in case it is a command with args.
+- Bug #1569790: mailbox.py: Maildir.get_folder() and MH.get_folder()
+ weren't passing the message factory on to newly created Maildir/MH
+ objects.
+
- Bug #1575506: Single-file mailboxes didn't re-lock properly in
their flush() method.