[okular] [Bug 445674] New: Okular: Typewriter cannot rendered non-Latin characters. (but the annotation created by other PDF reader can be rendered by Okular...)

[ono]

https://bugs.kde.org/show_bug.cgi?id=445674

            Bug ID: 445674
           Summary: Okular: Typewriter cannot rendered non-Latin
                    characters. (but the annotation created by other PDF
                    reader can be rendered by Okular...)
           Product: okular
           Version: unspecified
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: azazabc123 at gmail.com
  Target Milestone: ---

Created attachment 143682
  --> https://bugs.kde.org/attachment.cgi?id=143682&action=edit
This single PDF file contains both annotations created/edited by Okular and
Xodo. They are rendered incorrectly in Okular, but can be rendered in Xodo
correctly.

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug
symbols.
See
https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***
(1.) In Typewriter input box, non-Latin characters can be entered though, but
will not be rendered in document. Cyrillic alphabets and Japanese Kanji &
Hiragana are all disappeared:

https://invent.kde.org/graphics/okular/uploads/71e69e3298defce8cd9d2163a11c1104/Screenshot_20211118_113122.png

(2.) Even though set font with `Noto Sans CJK JP` (Which should include Latin,
Cyrillic, Greek, Japanese Kanji+Hiragana+Katakana), the characters still cannot
be showed:

https://invent.kde.org/graphics/okular/uploads/bce8badba4985a8b6f03edce50843722/Screenshot_20211118_113837.png

(3.) The more interesting is, open the annotated file with another PDF reader
(Xodo for Android), the annotation created by Okular can be read & rendered
correctly:

https://invent.kde.org/graphics/okular/uploads/18c71a48ac48b81038c5dd1a80caaa2a/Screenshot_20211118-114739335.jpg

(4.) The most interesting is, if:
  (a) Create text annotation with some other proprietary PDF reader (for
example, Xodo PDF Reader). **OR**
  (b) Process the Okular-annotated *.pdf file with `pdftk` (for example: `pdftk
okular-annotated.pdf cat 1 output pdftk-processed-okular-annotated.pdf`)
The non-Latin text annotations are visible in Okular.

STEPS TO REPRODUCE
(In Okular)
1. Alt+5 to use Typewriter to create a text annotation.
2. Enter Latin & non-Latin characters into Typewriter.
3. The non-Latin characters will become invisible.
4. Save file.

(In Xodo PDF Reader)
5. Open the Okular-saved-file with Xodo PDF Reader, 
  (a) Create any text annotation, **OR** 
  (b) Edit the existed Typewriter annotations created by Okular 
6. Save file.

(In Okular)
7. Open the Xodo-saved-file with Okular, the non-Latin annotations are rendered
CORRECTLY.
8. HOWEVER, if modifying these correct annotations via Okular, the non-Latin
characters will become invisible again...

OBSERVED RESULT

I tested with Xodo and `pdftk`, as long as the PDF files containing
Okular-created annotations are saved by them, all non-Latin characters are all
rendered correctly.

EXPECTED RESULTS

Okular can **create or edit** Typewriter annotation & display all non-Latin
characters.

SOFTWARE/OS VERSIONS
- Okular version: `21.08.2`
- Linux/KDE Plasma: Manjaro (rolling upgrade distro),
- KDE Plasma Version: `5.22.5`
- KDE Frameworks Version: `5.87.0`
- Qt Version: `5.15.2`


ADDITIONAL INFORMATION

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