bug#61132: xfce 4.18 issues: gsettings, icons missing, and logout need long time

["宋文武 via Bug reports for GNU Guix" <bug-guix@gnu.org>]

> 宋文武 <iyzsong@envs.net> writes:
>
>> During my tests, I find some issues though:
>>
>> 1. in xfce4-appearance-settings, switch the theme to greybird-dark will
>> kill it, with output:
>>
>> ```
>> (xfce4-appearance-settings:13788): Gtk-WARNING **: 10:53:21.078:
>> Could not load a pixbuf from
>> /org/gtk/libgtk/theme/Adwaita/assets/check-symbolic.svg.
>> This may indicate that pixbuf loaders or the mime database could not be found.
>>
>> (xfce4-appearance-settings:13788): GLib-GIO-ERROR **: 10:53:23.264:
>> Settings schema 'org.gnome.desktop.interface' does not contain a key
>> named 'color-scheme'
>> ```
>>
>> I think this is due to our gsettings-desktop-schemas is old.
>>
>> 2. some icons are missing, and by default there is no pixbuf loader for
>> svg.  With a manually set GDK_PIXBUF_MODULE_FILE, I get better result
>> with elementary-xfce-icon-theme (the adwaita icon themes still missing
>> some icons).
>>
>> 3. logout via xfce4-session-logout will wait more about 30s for me,
>> sometimes it does logout immediately, no idea...
>>
>> 4. mousepad output:
>> Mousepad-Message: 11:00:34.614: Plugin directory
>> '/gnu/store/0m4rqqn3gxwg6mafhccqjwwvqdz1a5sr-mousepad-0.5.10/lib/mousepad/plugins'
>> not found
>> GLib-GIO-Message: 11:00:34.614: Using the 'memory' GSettings
>> backend.  Your settings will not be saved or shared with other
>> applications.
>>
>> The default gsettings backend is dconf, I guess some applications like
>> mousepad need fix to enable dconf or use the keyfile backend for
>> gsettings...
>>
>> I now open a bug for thoes issues.
>>
>
> 5. Thunar start slowly
>
> When I update to xfce 4.18, thunar start need 5 second, when I
>
> 1. backup my xfce4 config.
> 2. rm my old xfce4 config.
> 3. run xfce4 and quit.
> 4. restore old xfce4 config.
> 5. run xfce4 again.
>
> The problem dispear, I do not know why.

Except gsettings for mousepad, which i now set
`GSETTINGS_BACKEND=keyfile` myself, the issues seems all fixed now.
Closing..