[okular] [Bug 433979] New: American tax forms checkbox state cannot been seen when form is hidden

[Leonard Lausen]

https://bugs.kde.org/show_bug.cgi?id=433979

            Bug ID: 433979
           Summary: American tax forms checkbox state cannot been seen
                    when form is hidden
           Product: okular
           Version: 20.12.2
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: leonard at lausen.nl
  Target Milestone: ---

SUMMARY
IRS Tax forms such as https://www.irs.gov/pub/irs-pdf/f1040.pdf contain various
checkboxes. In "Show Form" mode, these checkboxes are editable, but they do no
longer show up in the printout or no-"Show Form" mode. This is unlike Gnome's
Evince, which is also poppler based but does show the ticked checkboxes in
printout.

As this works in Evince, suspect to be a Okular specific rendering problem?

STEPS TO REPRODUCE
1. wget https://www.irs.gov/pub/irs-pdf/f1040.pdf
2. okular f1040.pdf
3. Click "Show Forms"
4. Check a box
5. Print the form or click "Show Forms" again

OBSERVED RESULT
Ticked checkbox is no longer displayed.

EXPECTED RESULT
Ticked checkbox is visible.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.21.2
KDE Frameworks Version: 5.79
Qt Version: 5.15.2

ADDITIONAL INFORMATION
This appears unrelated to the XFA content. The same problem applies to
f1040-noxfa.pdf file obtained via "pdftk f1040.pdf output f1040-noxfa.pdf
drop_xfa"

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