Feature Request: Retrieve Metadata for PDF -> chancel

Using Zotero shortly and till now I like it very much.
One small feature request: The Retrieve Metadata for PDF Dialog only has a Close-Button but should also have a chancel button. I mean it sometimes happens that the PDF was not correctly recognized - well that is expected and okay - but than you already see the wrong title and everything but still you have to close it and delete the new entry. A chancel button would be just nice :).

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