Don't run multiple instances when calling xidlehook again

[Shourai]

Since it is possible to append multiple --timers.
Would it be possible to add a way for it to detect if there is already an instance
of xidlehook running and if it is don't run another instance?

For example, if I run picom -b twice, it detects than another instance is already running
and does nothing.

Sometimes I have to reload my window manager and in the startup script of the window
manager it also starts up xidlehook.
To mitigate this I wrote a simple if-statement to check if it is already running.
But it would preferable if the program checked it instead.

[ghost]

You can mitigate this easily. Let's say you run i3. Each time you re-login, xidlehook instances increase.
You can fix this easily by killing xidlehook the moment you exit i3.
bindsym <key> exec --no-startup-id pkill xdlehook | i3-msg exit