[okular] [Bug 471796] New: pdf with forms does not handle special characters

[al F]

https://bugs.kde.org/show_bug.cgi?id=471796

            Bug ID: 471796
           Summary: pdf with forms does not handle special characters
    Classification: Applications
           Product: okular
           Version: 23.04.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: public at mellomrommet.no
  Target Milestone: ---

SUMMARY
When clicking "show forms" and filling in, everything looks fine. However,
clicking "Show forms" again after filling in text, `æ` and `å` just disappears
while `ø` is changed to `ł`. If filling in `ł` it disappears.

Font sizes are also distorted, it seems Okular adjusts the size to fill each
form entirely, rendering the document layout ugly. Printing uses the wrong
display, even if forms are currently showing the correct characters.

STEPS TO REPRODUCE
1. Download
https://www.politiet.no/globalassets/02-tjenester-admin/politiattest/bekreftelse-pa-formal-med-soknad-om-politiattest.pdf
2. Open with Okular and click "Show forms". Fill in text containing special
characters (the Norwegian æ, ø, å or others like ł or µ)
3. Click "Show forms" again.

OBSERVED RESULT
Text is incorrectly displayed and printed

EXPECTED RESULT
Text should be correctly displayed and printed

SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux 
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.106.0
Qt Version: 5.15.9
Kernel Version: 5.15.114-2-MANJARO (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION
Filling in forms / saving / opening / displaying in Firefox works as expected.
Printing to pdf from Firefox and opening in Okular, characters display
correctly but font sizes are inconsistent.

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