Managesieve 8.9 hangs on filters containing ".. " (dot dot space)

[Kurgan-]

Managesieve plugin version 8.9 (in Roundcube 1.3.0) hangs while retrieving contents of a filter that has a text field (it's a vacation auto reply filter) where there is a row that begins whith ".. " (dot dot space)

When it hangs, it runs forever until php times out.

In Apache, I see this in the log:

172.16.2.153 - - [29/Aug/2017:08:48:09 +0200] "GET /?_task=settings&_action=plugin.managesieve HTTP/1.1" 500 3177 "https://webmail.XXXXXXX.com/?_task=settings" "Mozilla/5.0 (Windows NT 10.0; WOW64; rv:54.0) Gecko/20100101 Firefox/54.0"

Previous versions (an old roundcube installation) worked.

Removing the ".. " from the beginning of the text row solved the issue.

Managesieve server is from Dovecot (version 2.2.13), and if I use a different sieve client it does not hang, so it seems Dovecot is not at fault.

The sieve filter that causes the issue is attached.
causes-hang.sieve.txt

[alecpl]

Sounds like a duplicate of #5838, could you confirm?

[Kurgan-]

It could be. If the attached sieve file works properly after the patch proposed in 5838 (which means you can open it in the web interface) I suppose that it's in fact a duplicate.

Thanks

[alecpl]

Confirmed. The attached file works for me.