Allow customization of the number of items in the recent list
There should be an option to increase how many items are on the "Open Recent" list.
Looks like this is the option: void Gtk::RecentChooser::set_limit(int limit)
And maybe here is where that should be added:
https://github.com/GNOME/meld/blob/master/meld/meldwindow.py#L126