[khelpcenter] [Bug 503583] New: KHelpCenter's content area is transparent, and produces "ghost windows"

https://bugs.kde.org/show_bug.cgi?id=503583

            Bug ID: 503583
           Summary: KHelpCenter's content area is transparent, and
                    produces "ghost windows"
    Classification: Applications
           Product: khelpcenter
           Version: unspecified
          Platform: Other
               URL: https://superuser.com/revisions/629766/1#content:~:tex
                    t=That%20is%20called%20a%20%E2%80%9Cghost%20window%E2%
                    80%9D
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 180816
  --> https://bugs.kde.org/attachment.cgi?id=180816&action=edit
A Screencast Demonstrating The Problem

SUMMARY

KHelpCenter's QtWebEngine instance is transparent, and produces "ghost
windows". [^1]

STEPS TO REPRODUCE

Merely invoke `khelpcenter`.

SOFTWARE/OS VERSIONS

I am using `khelpcenter-25.04.0-1.fc42.x86_64` on:

> Operating System: Fedora Linux 42  
> KDE Plasma Version: 6.3.4  
> KDE Frameworks Version: 6.13.0  
> Qt Version: 6.9.0  
> Kernel Version: 6.14.4-300.fc42.x86_64 (64-bit)  
> Graphics Platform: Wayland

> Graphics Processor 1: AMD Radeon RX 5700  
> Graphics Processor 2: AMD Radeon Graphics

ADDITIONAL INFORMATION

The version of KHC I'm using isn't listed in `enter_bug.cgi`'s `<select
id="version">` field, so it's listed as "Unspecified".

[^1]:
https://superuser.com/revisions/629766/1#content:~:text=That%20is%20called%20a%20%E2%80%9Cghost%20window%E2%80%9D

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