CHUI-296 FIXED (Unread IM messages icon not showing in conversation log)
CHUI-296 FIXED (Unread IM messages icon not showing in conversation log)

- Sometimes IM floater with offline unread messages is visible but not in visible chain and the flag of offline unread messages is erroneously reset.
So made condition of whether floater is visible more strict.

gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm,gabeharms/firestorm