Testing Done:
Built and followed the sasl instructions on freenode's site https://freenode.net/kb/answer/pidgin and connected and identified me to nickserv just fine. Also I checked Debian and they're manually enabling this so if there was an issue users were seeing we would have heard about it by now as this line was last changed in 2013.
Reviewed at https://reviews.imfreedom.org/r/26/
/** @page connection-signals Connection Signals
@signals
@signal signing-on
@signal signed-on
@signal autojoin
@signal signing-off
@signal signed-off
@signal connection-error
@endsignals
@see connection.h
<hr>
@signaldef signing-on
@signalproto
void (*signing_on)(PurpleConnection *gc);
@endsignalproto
@signaldesc
Emitted when a connection is about to sign on.
@param gc The connection that is about to sign on.
@endsignaldef
@signaldef signed-on
@signalproto
void (*signed_on)(PurpleConnection *gc);
@endsignalproto
@signaldesc
Emitted when a connection has signed on.
@param gc The connection that has signed on.
@endsignaldef
@signaldef autojoin
@signalproto
gboolean (*autojoin)(PurpleConnection *gc);
@endsignalproto
@signaldesc
Emitted when a connection has signed on, after the signed-on signal, to
signal UIs to autojoin chats if they wish. UIs should connect to this
with @c PURPLE_SIGNAL_PRIORITY_HIGHEST to allow plugins to block this
signal before the UI sees it and then re-emit it later.
@param gc The connection that has signed on.
@return @c TRUE if the signal was handled or @c FALSE otherwise. In
practice, the return value is irrelevant, as it really only
exists so plugins can block the UI's autojoin.
@since 2.7.0
@endsignaldef
@signaldef signing-off
@signalproto
void (*signing_off)(PurpleConnection *gc);
@endsignalproto
@signaldesc
Emitted when a connection is about to sign off.
@param gc The connection that is about to sign off.