[okular] [Bug 407579] New: Bad behavior of RadioButton groups in Optional Contents

[Édouard Canot]

https://bugs.kde.org/show_bug.cgi?id=407579

            Bug ID: 407579
           Summary: Bad behavior of RadioButton groups in Optional
                    Contents
           Product: okular
           Version: 1.6.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: Edouard.Canot at univ-rennes1.fr
  Target Milestone: ---

Created attachment 120100
  --> https://bugs.kde.org/attachment.cgi?id=120100&action=edit
PDF 1.5 Standard Compliant example using RBGroups

SUMMARY

When using RBGroups (RadioButton groups) of Optional Contents, we can switch
from one group to another one in the "layers" panel of okular, but the drawing
of the corresponding graphic objects is not updated.

STEPS TO REPRODUCE
1. open the attached file "Labels_and_Languages_3_OC.pdf"
2. open the "layers" panel
3. open the "Language" group
4. switch from one language to another

OBSERVED RESULT
The switching between languages in the user interface is correct (mutually
exclusive Optional Contents is implemented via the RadioButton group) but the
display is not updated: texts are overwritten on the display.

EXPECTED RESULT
Each language should lead to different text strings.


SOFTWARE/OS VERSIONS
Linux distro: Ubuntu-19.04 (and before)
Okular version: 1.6.3
PDF Backend: 0.6.5
KDE Framework: 5.56.0
Qt version: 5.12.2

ADDITIONAL INFORMATION
The PDF has been generated by my own graphic library Muesli. You can open the
attached PDF file with any text editor since it uses only ASCII characters. To
my knowledge, it is standard compliant: 'mupdf' doesn't claim about any errors,
and the "PDF Tools Online" validator
(https://www.pdf-online.com/osa/validate.aspx) returns nothing special about
it:      
    Validating file "Labels_and_Languages_3_OC.pdf" for conformance level
pdf1.5
    The document does conform to the PDF 1.5 standard.
    Done.

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