Gtk.EntryCompletion:cell-area
"cell-area" Gtk.CellArea : Read / Write / Construct Only
The Gtk.CellArea used to layout cell renderers in the treeview column.
If no area is specified when creating the entry completion with Gtk.EntryCompletion.new_with_area a horizontally oriented Gtk.CellAreaBox will be used.
Since 3.0