[okular] [Bug 425148] okular import of old embedded annotations does not import the original create/modify time stamp

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https://bugs.kde.org/show_bug.cgi?id=425148

--- Comment #10 from jprorama at gmail.com ---
I'm starting to wonder if this might actually be an issue in Poppler but need
some guidance in understanding the logic that Okular follows in the conversion
process.  

As noted, Okular is correctly restoring the original create/mod dates of the
annotation from its original storage. It prompts the user to save the PDF to a
file to preserve the annotations with the PDF.

At this point I have traced lots of code, but it seems to come down to Okular
handing of the Save operation to the PDFGenerator::save() method.  There is a
QHashIteration across the annotations that compares unique ids between okular
annotations and poppler annotations, but doesn't seem to have any other affect.

The actual save of the current Okular document that needs migration appears to
be handed off to the Poppler::PDFConverter().  It seems like this utility takes
the current Okular PDF document and saves it out to a temporary file.  It's
during this operation that the original annotation create/modify times are
lost.  The temp file is then copied to the saveAs target, but by that time the
times are already set to the current date.

Is this understanding correct?

If so, is there any way to control the conversion of the annotations within
Okular to avoid this issue.  I thought the PopplerAnnotationProxy might be able
to, but it doesn't seem to be invoked by Poppler during the PDFConverter.

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