[okular] [Bug 410642] Reviews are not show

[Tobias Deiminger]

https://bugs.kde.org/show_bug.cgi?id=410642

Tobias Deiminger <haxtibal at posteo.de> changed:

           What    |Removed                     |Added
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                 CC|                            |haxtibal at posteo.de

--- Comment #9 from Tobias Deiminger <haxtibal at posteo.de> ---
(In reply to Albert Astals Cid from comment #8)
> My suggestion is you attach that pdf to the bug trackers of the other pdf
> viewers and say "look, it works on Adobe Reader, so it should work for you
> too" and see what they say
They are aware, see below. Issue happens because the FreeText annotation in the
attached PDF has no AP (appearance stream).

Firefox uses PDF.js, they have an issue with FreeText without AP:
https://github.com/mozilla/pdf.js/issues/6810
Chrome uses PDFium, seems they have issue with FreeText in general:
https://bugs.chromium.org/p/pdfium/issues/detail?id=569
Okular, Evince (and Zathura, depending on configuration) use poppler. Poppler
displays correctly without AP, but can't store AP when saving the PDF.
Adobe displays (copes without AP) and writes (saves AP) correctly.

PDF 1.7 says AP is optional. I.e., readers must be able to display the
annotation anyway.
PDF 2.0 says AP is mandatory. I.e., writers must be able to generate and save
AP along with the annotation.

So no use in blaming some party, all could do better. Solving is just not that
easy and needs an extra portion of spare (or sponsored) time. Now that PDF 2.0
has made AP mandatory, I believe duty has shifted somewhat to poppler side. 

I'd suggest to close this one and open an issue at poppler side?

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