Deprecate PdfPages(keep_empty=True). #26469
Merged
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... because 0-page pdfs are not valid pdf files.
Explicitly passing keep_empty=False remains supported for now to help transitioning to the new behavior.
I also delayed file creation in backend_pdf.PdfPages as that seems simpler than re-deleting the file at closure if needed. I further dropped
__slots__
as the micro-optimization of these classes seem pointless (backend_pdf.PdfPages is wrapping a PdfFile object which is much larger anyways).Closes #11771 (see #11771 (comment)). Whether we want #11771 (comment) too is another question.
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