Bug#994031: configuration directories read order causes local config to be overridden

[Christian Kreidl <debian@chk.cksf.de>]

Package: lightdm-gtk-greeter
Version: 2.0.8-2
Severity: normal

Dear Maintainer,

lightdm and lightdm-gtk-greeter read configuration files from .d/ directories in:
 /usr/share/lightdm/
 /usr/local/share/lightdm/
 /etc/xdg/lightdm/

and from file from /etc/lightdm/ .

But the order in which these directories are parsed differs between lightdm and lightdm-gtk-greeter.

lightdm-gtk-greeter reads files from /usr/local/share/lightdm/ first, thus local configuration is 
overridden by config in /usr/share/lightdm/

--snip--
** Message: 09:53:00.969: Starting lightdm-gtk-greeter 2.0.8 (Nov  4 2020, 16:56:54)
** Message: 09:53:00.969: [Configuration] Reading file: 
/usr/local/share/lightdm/lightdm-gtk-greeter.conf.d/50_test.conf
** Message: 09:53:00.969: [Configuration] Reading file: 
/usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_debian.conf
** Message: 09:53:00.969: [Configuration] Reading file: 
/etc/xdg/lightdm/lightdm-gtk-greeter.conf.d/50_test.conf
--snip--

lightdm-gtk-greeter should order directories the same as lightdm does:
 /usr/share/lightdm/
 /usr/local/share/lightdm/
 /etc/xdg/lightdm/


Thanks!

Christian