remove drag and drop from the notebook in gtkconv
Review Request #1026 — Created Oct. 12, 2021 and submitted — Latest diff uploaded
The new PidginConversationWindow is using a GtkTreeView for navigation and the drag and drop code is just getting in the way while trying to migrate everything so deleting it now makes it easier to migrate.
Opened two XMPP conversations, verified drag and drop longer worked and that there were no new compiler warnings.