Vast rewrites when importing a wrongly cased author
When I have an author (e.g., "Asimov, Isaac") in my library, and I import a book that has the same author name but with differing case, e.g. "ASIMOV, Isaac", Calibre interprets this as an author name change and updates the filenames on disk and all existing opf files of books of that author.
This can make importing a folder of books pretty slow.
Is there a way to avoid this?
Running Calibre 2.78.0 on Fedora 25.
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