[Bug]: Finder Extension force-enabled, then leaking processes

[vszakats]

• This is a bug, not a question or a configuration issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server and Desktop Client are up to date. See Server Maintenance and Release Schedule and Desktop Releases for supported versions.
• I agree to follow Nextcloud's Code of Conduct

Bug description

Nextcloud client enables its Finder Extension on every Nextcloud.app
run.

Honoring user choice would be important here. The bigger issue is
that the Finder Extension has been leaking tasks for years, resulting
in dozens or hundreds of orphan processes consuming RAM and
CPU cycles. The latter problem appears to be a known bug, closed
as fixed even though it's leaking processes even with the latest
version: Ref: #3967

This can only be fixed by killing these processes from time to time,
or it could be possible to fix it by disabling the Finder Extension
(which I don't need anyway). The latter doesn't work because it gets
re-enabled every time Nextcloud.app is launched.

Steps to reproduce

1. Disable Nextcloud Finder Extension:
   System Preferences → Extensions → Find Extensions:
   Uncheck 'Nextcloud Extensions'
2. Run 'Nextcloud.app'
3. Go to:
   System Preferences → Extensions → Find Extensions
   'Nextcloud Extensions' is enabled again.

Expected behavior

After disabling the Nextcloud Finder Extension via System Preferences,
it stays disabled until I explicitly enable it again. Running Nextcloud.app
never enables this without consent or an explicit configuration setting.

Operating system

macOS

Which version of the operating system you are running.

Monterey (any)

Nextcloud Server version

any

Nextcloud Desktop Client version

3.10.1 (probably any from the last few years)

Are you using an external user-backend?

No

[vszakats]

Workaround:

[ -d /Applications/Nextcloud.app/Contents/PlugIns/FinderSyncExt.appex ] && \
  pluginkit -r /Applications/Nextcloud.app/Contents/PlugIns/FinderSyncExt.appex
# then kill the extensions
killall -9 -m FinderSyncExt