Can't add books to collections when one books is already in the collection
In Gnome Books, if you select multiple books and try to set their Collections, but one or more of the books is already in the Collection, then it will show the "mixed" checkbox. Clicking the checkbox does nothing.
Expected behaviour: Clicking the "mixed" checkbox changes to a tick (to add all selected books). Clicking again unticks (to remove all selected books).
gnome-books-3.28.2-1.1.x86_64 on openSUSE Tumbleweed
Edited by IBBoard