I'm not the greatest fan of the cumulative behavior. It's surprising, different from all the rest of the searching mechanism and likely to generate why does this work this way type bug reports.
If I understand correctly, the use case is basically generating a "report" of some kind over your books? Like series with the last book or whatever? Might be better to have a separate reports tool like there is in the editor, in a popup rather than trying to shoehorn it into the search + book_list view.
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