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The bookmark filter, the Comments panel filter and the command palette lowercased with str::to_lowercase, which follows no locale: "İSTANBUL" became "i̇stanbul" (a combining dot added) and "ı" has no case pair, so "istanbul" never found the bookmark "İSTANBUL ŞUBESİ" and "imzalayın" never found a comment "Lütfen İMZALAYIN". They now fold with pdfcraft_render::text::fold_case, the folding Find and Search & Redact use (made public here): I, i, İ and ı count as one letter and every other character folds to its own lowercase.