nixpkgs/pkgs/desktops/pantheon/desktop/elementary-session-settings/default-elementary-dockitems.desktop

[Desktop Entry]
Type=Application
Name=Instantiate Default elementary dockitems
Exec=@script@
StartupNotify=false
NoDisplay=true
OnlyShowIn=Pantheon;
X-GNOME-Autostart-Phase=EarlyInitialization