[Nix-dev] Concatenation of values

[Arseniy Seroka]

Hello!
For example we have `services.xserver.displayManager.sessionCommands`.
If we enable slim then we have some lines added to it.
If we add something there in our `configuration.nix` then it appears
that our value is added before the value added by slim's config.
So the question is how does this mechanism works (concatenation of values)
and how I can tell nix to do smth like "${old} + new lines of cfg"?

-- 
Sincerely,
Arseniy Seroka
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