[okular] [Bug 439488] New: Some letters are omitted in the visible hint for the electronic signature.

[smihael]

https://bugs.kde.org/show_bug.cgi?id=439488

            Bug ID: 439488
           Summary: Some letters are omitted in the visible hint for the
                    electronic signature.
           Product: okular
           Version: 21.04.1
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: smihael at gmail.com
  Target Milestone: ---

Some letters are omitted in the visible hint for the electronic signature. Thus
names might be shown incorrectly, which is a blocking bug that can prevents
from using Okular for signing documents. Instead of "Test Testič" documents
show a stamp with "Test Tesevi". 

STEPS TO REPRODUCE
1. Get a recent version of Okular (21.04.1) with a recent version of the
poppler backend (21.03.0) that enable signing PDFs with a visible hint as
described at https://cloudstore.zih.tu-dresden.de/index.php/s/j5BKKyJYZFBzGsB
2. Add a certificate with first or last name that contains c with caron (č). Š,
ž, ć. đ and other non-ASCII letters are probably also affected. 
3. Open pdf, go to Tools>Digitally sign and draw a rectangle in the area you
want to add a visual hint for the digital signature.


OBSERVED RESULT

A gray box saying Signed by Name Surname and date but without letter "č".

Signed by: Test Testi
....................................
Date: 2021-07-04T20:24:31



EXPECTED RESULT

Full name including non-ASCII letters should be added.

Signed by: Test Testič
....................................
Date: 2021-07-04T20:24:31

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