Gets the accumulative preferred width for height for all rows which
have been requested for the same said height with this context.
After gtk_cell_area_context_reset() is called and/or before ever
requesting the size of a GtkCellArea, the returned values are -1.
Gets the accumulative preferred width for height for all rows which have been requested for the same said height with this context. After gtk_cell_area_context_reset() is called and/or before ever requesting the size of a GtkCellArea, the returned values are -1.