[okular] [Bug 519407] New: (Default) Values in PDF Forms are not handled and displayed correctly for Textfields

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https://bugs.kde.org/show_bug.cgi?id=519407

            Bug ID: 519407
           Summary: (Default) Values in PDF Forms are not handled and
                    displayed correctly for Textfields
    Classification: Applications
           Product: okular
      Version First 26.04.0
       Reported In:
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: mail+kde at branleb.de
  Target Milestone: ---

Created attachment 191793
  --> https://bugs.kde.org/attachment.cgi?id=191793&action=edit
A PDF Form reduced to an MWE (reduced from my original document which I cannot
share here)

SUMMARY
When opening a PDF Form with a value for a form element stored, that value is
not always displayed by okular in the default PDF display mode. This is true
for both for the value and the default value of Textfield.

However, when activating the forms mode via the "show forms" button, the value
is correctly shown as the field value. (A "lonely" default value is not shown
then either. This seems to be caused by poppler FormFieldText::text(), but the
rest seems to be okular specific)

And: If you change the value of a Textfield, that value will also be shown
afterwards in the default just display  mode. (Probably, because okular adds an
additional object entry to the PDF file which is the one shown.)

So: Editing TextField in a PDF Form - at least judged by the result displayed -
seems to work fine, but okular seems to ignore some values for the textfield 
in the pdf form

STEPS TO REPRODUCE
1. Open a PDF Form with a textfield with either an default value or value
stored (PDF Dict DV, V keys)
2. Enter the form edit mode ("Show Forms Button")
3. Change the value of any such field 
4. Leave Form edit mode
5. Save PDF (under different file name) and open to verify

OBSERVED RESULT
After 1: Okular does not show a (pdf forms) fields stored value or default
value in normal display mode

After 2: Okular does now show a Value (PDF Dict /V key), but no default value
(/DV key) [seems to be caused by poppler]

After 4: Okular does not show a textfield value.

After 5: Okular still shows a value.

EXPECTED RESULT
1. Okular should display (default) value set for a form field immediately after
file open.
2. Okular should display the value in the field - irregardless whether in form
edit mode or in default display mode.
3. Okular should also show the default value

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20260419
KDE Plasma Version: 6.6.4
KDE Frameworks Version: 6.25.0
Qt Version: 6.11.0
Kernel Version: 6.19.12-1-vanilla (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 PRO 4750U with Radeon Graphics
Memory: 64 GiB of RAM (62.2 GiB usable)
Graphics Processor: AMD Radeon Graphics


ADDITIONAL INFORMATION
1. A dump of the field data (especially value and default value) via the 
"pdftk file.pdf dump_data_fields" command shows the "plain data situation"
2. e.g. the firefox pdf viewer does display the form (and this MWE) correctly

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