negate filter

[bfd69]

Describe your suggested feature

hellooo, is it possible :
1: to have a negate filter ? the purpose it to have all books that don't match the filter
2: to be possible to use filter along side with selection, actually if i use a filter and then select books, the filter button disappears and inversely

i'm using the version 1.9.2
thanks a lot for reading me !

Other details

No response

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