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Text selection works fine for me with PDFs converted by calibre. The only case I know of when it will not work is if the epub has characters in it for which a suitable font was not found on the system, which will cause the renderer to draw the text as outlines instead.
Oh and by the way, PDF is literally a stream of characters with no word, line or other semantic information. PDF viewer manage to work around that by using heuristics to guess the extent of words/lines. (The exception is tagged PDF, but those are pretty rare).
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