[dolphin] [Bug 483734] New: Dolphin Fails to Remember Default Applications in Non-KDE Environments

[raven2cz]

https://bugs.kde.org/show_bug.cgi?id=483734

            Bug ID: 483734
           Summary: Dolphin Fails to Remember Default Applications in
                    Non-KDE Environments
    Classification: Applications
           Product: dolphin
           Version: 24.02.0
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: tonda.fischer at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

SUMMARY
***
Dolphin forgets default applications for file extensions outside of KDE
environments, such as in awesomeWM, requiring re-assignment after each restart.
***

### STEPS TO REPRODUCE
1. Set default applications for various file extensions in Dolphin. The apps
are remembered and called correctly.
2. Restart PC.
3. Open Dolphin and try to open files with previously set default applications.
Information is lost. Necessary to insert default app again...

### OBSERVED RESULT
Dolphin does not remember the set default applications for any file extensions
and prompts for default application selection again. After a system restart,
Dolphin still does not remember any default applications for file extensions.

### EXPECTED RESULT
Dolphin should remember the default applications for file extensions across
different desktop environments and sessions, similar to its behavior within KDE
Plasma 5 environments. This expected behavior indicates a potential issue with
Dolphin's integration or use of `xdg-open` or similar mechanisms for handling
default applications in non-KDE environments.

### SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.0.2
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.9-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 6700 XT
Manufacturer: Gigabyte Technology Co., Ltd.
Product Name: X570 AORUS ULTRA
System Version: -CF

### ADDITIONAL INFORMATION
This issue seems specific to Dolphin; other applications do not exhibit this
problem and correctly remember their default application settings across
sessions and different window managers. This might suggest a problem with how
Dolphin interacts with the system's default application settings outside of KDE
environments, possibly related to `xdg-open` or another mechanism Dolphin uses
to manage default applications.

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