[kde] [Bug 455452] New: Plasma 5.25 Update breaks the ability to use other window managers by setting the KDEWM environment variable

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=455452

            Bug ID: 455452
           Summary: Plasma 5.25 Update breaks the ability to use other
                    window managers by setting the KDEWM environment
                    variable
           Product: kde
           Version: unspecified
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: jonah.chen at mail.utoronto.ca
  Target Milestone: ---
             Flags: version_5_applied+, Usability+

I run the i3 window manager and it has been working alongside KDE for me for
years. When I updated to plasma 5.25 this broke and I was not able to use my
other window manager. I checked the environment variable with `echo $KDEWM` and
the output is still the expected `/usr/bin/i3`

STEPS TO REPRODUCE
1.  Upgrade to plasma 5.25
2. Create a new desktop in `/usr/share/xsessions` with 
```
[Desktop Entry]
Type=XSession                                                                  
Exec=env KDEWM=/usr/bin/i3 /usr/bin/startplasma-x11                            
DesktopNames=KDE
Name=Plasma with i3
Comment=Plasma with i3
```
3. Log in to the new session you just created. 

OBSERVED RESULT
Plasma starts up with the kwin window manager.

EXPECTED RESULT
Plasma should start up with the i3 window manager.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux x86_64 with Linux 5.18.3
(available in About System)
KDE Plasma Version: 5.25.0
KDE Frameworks Version: 5.95
Qt Version: 5.15.4

ADDITIONAL INFORMATION
Everything works after downgrading the kde packages (on arch) to 2022 june 15.
This is plasma 5.24.5.

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