
Since both the `_items` object and the `_allItems` array include the same items, the difference between those variables seems unclear. The real difference between them (except the different data type) is that `_allItems` is ordered in the same order as the visible grid, so rename `_allItems` to `_orderedItems` which makes that more obvious. https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/799