[SM-PLUGINS] avelsieve - problem setting imap flags

[Giovanni P. <gio...@pa...>]

I have exactly the same problem posted by Joachim Boltz more than 1 year 
ago with the same subject.

I'm using the following packages (all are standard .deb packages of 
Ubuntu Server 10.04.3 LTS):
- avelsieve 1.9.9-1
- squirrelmail 1.4.20-1ubuntu0.1
- dovecot 1.2.9-1ubuntu6.5

avelsieve is generating the following rule:

if header :contains "From" "aSender"
{
	fileinto :flags ["Seen"]   "INBOX.aFolder";
}

The rule correctly moves the messages from aSender to INBOX.aFolder, but 
the message is still unread: imap Seen flag has not been set.

If I manually change the rule appending two backslashes, it works: all 
messages moved to INBOX.aFolder are also marked as read.

if header :contains "From" "aSender"
{
	fileinto :flags ["\\Seen"]   "INBOX.aFolder";
}

How can I fix this ?