[khelpcenter] [Bug 523891] New: KHelpCenter: Dark theme rendering bug in HTML/DocBook view (black text on black background in Glossary)

https://bugs.kde.org/show_bug.cgi?id=523891

            Bug ID: 523891
           Summary: KHelpCenter: Dark theme rendering bug in HTML/DocBook
                    view (black text on black background in Glossary)
    Classification: Applications
           Product: khelpcenter
      Version First unspecified
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

DESCRIPTION
When using KDE Plasma in Dark Mode, the right pane (QtWebEngine container) in
khelpcenter fails to apply proper CSS contrast inversion to local HTML/DocBook
files (e.g. khelpcenter/glossary/index.docbook and kde-default.css). When
clicking a glossary term, the view briefly flashes white and then turns
completely black, rendering the text invisible (black-on-black).

STEPS TO REPRODUCE

Enable system-wide Dark Mode in KDE Plasma (Breeze Dark).

Open khelpcenter.

Navigate to the Glossary section on the left sidebar.

Click on any entry (e.g. Git, KDE, Qt).

OBSERVED RESULT
The right document pane flashes briefly with white background/black text, then
immediately switches to a solid #000000 background without updating the text
color to white/light grey. The page content becomes unreadable.

EXPECTED RESULT
The document pane should either render readable light text on a dark background
in accordance with the system palette, or maintain sufficient contrast for the
HTML text.

SOFTWARE/OS VERSIONS
Operating System: Tuxedo OS
KDE Plasma Version: (Hier Wert aus kinfo eintragen, z. B. 6.1.2)
KDE Frameworks Version: (Hier Wert aus kinfo eintragen, z. B. 6.3.0)
Qt Version: (Hier Wert aus kinfo eintragen, z. B. 6.7.1)

ADDITIONAL INFORMATION
Log output during execution:
View::langLookup "kdoctools6-common/kde-default.css"
View::langLookup "khelpcenter/glossary/index.docbook"
GBM is not supported with the current configuration. Fallback to Vulkan
rendering in Chromium

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