The gtk.cell_area_context.CellAreaContext used to compute the geometry of the cell view.
A group of cell views can be assigned the same context in order to ensure the sizes and cell alignments match across all the views with the same context.
gtk.combo_box.ComboBox menus uses this to assign the same context to all cell views in the menu items for a single menu (each submenu creates its own context since the size of each submenu does not depend on parent or sibling menus).
since 3.0
Get cellAreaContext property.