Can't set negative priority
As Section 2.2.2.3 of XMPP IM RFC (http://www.ietf.org/rfc/rfc3921.txt) priority is an integer between -128 and 127. In Gajim priority cannot be assigned to be lower than 0.
As Section 2.2.2.3 of XMPP IM RFC (http://www.ietf.org/rfc/rfc3921.txt) priority is an integer between -128 and 127. In Gajim priority cannot be assigned to be lower than 0.