xfconf: fix dbus may not be started in the startup of NixOS.

[gou4shi1]

Description

fix #3378 (comment)
ref:

home-manager/modules/misc/dconf.nix

Lines 102 to 106 in 693d76e

	if [[ -v DBUS_SESSION_BUS_ADDRESS ]]; then
	export DCONF_DBUS_RUN_SESSION=""
	else
	export DCONF_DBUS_RUN_SESSION="${pkgs.dbus}/bin/dbus-run-session --dbus-daemon=${pkgs.dbus}/bin/dbus-daemon"
	fi

output:

Feb 26 23:58:53 laptop hm-activate-cgq[1076]: Activating xfconfSettings
Feb 26 23:58:53 laptop hm-activate-cgq[1455]: dbus-daemon[1455]: [session uid=1000 pid=1455] Activating service name='org.xfce.Xfconf' requested by ':1.0' (uid=1000 pid=1458 com>
Feb 26 23:58:53 laptop hm-activate-cgq[1455]: dbus-daemon[1455]: [session uid=1000 pid=1455] Successfully activated service 'org.xfce.Xfconf'
Feb 26 23:58:53 laptop xfconfd[1465]: Name org.xfce.Xfconf lost on the message dbus, exiting.
Feb 26 23:58:53 laptop systemd[1]: Finished Home Manager environment for cgq.

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

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[ncfavier]

This seems to be taken verbatim from the dconf module; some deduplication would be nice, though I don't have any good ideas that don't force a dependency on dbus.

Please squash the commits into one and name it according to the contribution guidelines.

[ncfavier]

Oh, and please target master. We'll backport later if needed.

git rebase @~N --onto master...release-22.11 # replace N with how many commits you're rebasing
git push --force-with-lease
# now change the target branch on GitHub

[gou4shi1]

@ncfavier Thanks for your review :)

[gou4shi1]

Would it be merged?

[ncfavier]

I'm giving the other maintainers some time to review this; will merge in a couple days if no one objects.