[systemd-devel] Q: What is the correct way to use `xdg-desktop-autostart.target` with window managers?

[WieeRd]

I'm trying to use systemd as a XDG Autostart manager for WMs that does not
provide builtin support for autostart entries. At first, I simply tried to
`systemctl --user start` the target inside the window manager. However, it
quickly turned out that the target cannot and not meant to be manually
started and instead should be specified as a `Wants=` dependency.

But how exactly?

1. Which unit should be linked to the autostart target as `Wants=`
dependency?
Should the user /  WM author create / provide another user unit just so
that it can pull in the autostart target?

2. Looking at the source code, it seems that `OnlyShowIn=` detection relies
on the $XDG_CURRENT_DESKTOP environment.
Whose responsibility is it to set this variable? Display manager? Window
manager? Or by the user?

The man pages of `systemd.special` and `systemd-xdg-autostart-generator`
were the only documentations I could find about this feature, and I'm still
not sure what I'm supposed to do.
Thanks in advance for your help.
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