[poppler] File size doubling when saving with changes

[Adam Reichold]

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Hello,

I just had a user point out to me that when using the Qt frontend's
PDFConverter to save a file with changes (irrespective of whether some
were actually made) will double the file size in every iteration.
(Tested with it a few files using Poppler 0.22.1.)

I suspect this has something to do with incrementally updating the
document structure? Is this a known limitation in calculating the
change set or something like that or should I rather open a bug report
to track this?

Best regards, Adam.
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