bug#35298: thunar loose its icons on slim in Guix

[znavko@disroot.org]

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On gdm works nice like here http://lists.gnu.org/archive/html/bug-guix/2019-04/msg00018.html

But in my config with slim instead of gdm, thunar does not have icons like here: http://lists.gnu.org/archive/html/bug-guix/2019-03/msg00324.html
config:

;-*- mode: Scheme; -*-
;;this is znavko's cute config

(use-modules (gnu) (gnu system nss)
 (gnu system locale) ;;for locale-definition
 (gnu services desktop)
 (srfi srfi-1) ;;for remove function
 (gnu services networking) ;;for remove ntp
 (gnu services avahi) ;;for remove avahi
 (gnu services xorg)
 (gnu packages admin) ;;for wpa_supplicant
 )
(use-service-modules desktop)
(use-package-modules certs gnome)

(operating-system (host-name "antelope") (timezone "Europe/Moscow") (locale "en_US.utf8")
 (bootloader (bootloader-configuration (bootloader grub-bootloader) (target "/dev/sda")))
 (file-systems (cons (file-system (device "/dev/sda1") (mount-point "/") (type "ext4")) %base-file-systems))
 (swap-devices '("/dev/sda2"))

 (users (cons* (user-account (name "bob") (group "users")
 (supplementary-groups '("wheel" "netdev" "audio" "video"))
 (home-directory "/home/bob"))
 (user-account (name "mom") (group "users")
 (supplementary-groups '("wheel" "netdev" "audio" "video"))
 (home-directory "/home/mom"))
 %base-user-accounts))

 ;; This is where we specify system-wide packages.
 (packages (cons* nss-certs ;for HTTPS access
 gvfs ;for user mounts
 wpa-supplicant
 %base-packages))

 (services (cons*
 (service xfce-desktop-service-type)
 (service dhcp-client-service-type)
 (service slim-service-type
 (slim-configuration
 (xorg-configuration
 (xorg-configuration
 (extra-config 
 '("Section "InputClass"
Identifier "touchpad"
Driver "libinput"
MatchIsTouchpad "on"
Option "Tapping" "on"
EndSection")
 ))))
 )

 (modify-services 
 (remove (lambda (service)
 (member (service-kind service)
 (list ntp-service-type avahi-service-type
 bluetooth-service network-manager-service-type
 gdm-service-type)))
 %desktop-services) ;end of remove lambda services

 (wpa-supplicant-service-type config =>
 (wpa-supplicant-configuration
 (interface "wlp2s0")
 (config-file "/etc/wpa_supplicant/wpa_supplicant.conf")))

 (elogind-service-type
 c => (elogind-configuration (handle-lid-switch 'ignore)))
 ) ;;end of modify-services
 )) ;;end of services
 ;; Allow resolution of '.local' host names with mDNS.
 (name-service-switch %mdns-host-lookup-nss)

 ;;blacklist ugly sound speaker, blacklist ideapad_laptop for prevent soft blocking wlan
 (kernel-arguments '("modprobe.blacklist=pcspkr,snd_pcsp,bluetooth,ideapad_laptop"))

 ) ;;end of operating-system

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