[dolphin] [Bug 502660] New: Qt style is not preserved when a new Dolphin window is opened from an existing one with --style override

https://bugs.kde.org/show_bug.cgi?id=502660

            Bug ID: 502660
           Summary: Qt style is not preserved when a new Dolphin window is
                    opened from an existing one with --style override
    Classification: Applications
           Product: dolphin
           Version: 24.12.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected]
  Target Milestone: ---

SUMMARY
When a Dolphin window is started using the --style= argument to override the Qt
style, any new window created from it does not inherit the specified style.
Instead, the new window reverts to the default Qt style. In other app like
Konsole and Kate, the new window do inherit the style of the parent window.

STEPS TO REPRODUCE
1. Assume Breeze default Qt style
2. Start Dolphin with dolphin --style=kvantum, a Dolphine window with kvantum
Qt style appear
3. Use Ctrl-N or context menu to open a new window

OBSERVED RESULT
A new Dolphin window appear with the default Breeze style

EXPECTED RESULT
A new Dolphin window appear with the parent window's style (kvantum)

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 42
KDE Plasma Version: 6.3.4
KDE Frameworks Version: 6.12.0
Qt Version: 6.8.2

ADDITIONAL INFORMATION
I'm now using Dolphin in a different Qt style due to a recent change to
Breadcrumb. Waiting for
https://invent.kde.org/frameworks/kio/-/merge_requests/1842 to be released.

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