>[email protected] wrote:
>> In the "configuration information" of GTK+ 3 section, the key
>> "gtk-fallback-icon-theme" is used. However, in the GTK+ Reference
>> manual
>> (https://developer.gnome.org/gtk3/stable/GtkSettings.html#GtkSettings--gtk-fallback-icon-theme),
>> it said:
>>
>> GtkSettings:gtk-fallback-icon-theme has been deprecated since version
>> 3.10 and should not be used in newly-written code. This setting is
>> ignored.
>>
>> So, is this key still valid actually?
>According to your reference, no, it is not used.  However it doesn't seem
>to hurt anything.
>Fernando, should we just remove those two lines from the settings.ini files?
>   -- Bruce

Just to share my experience after some tests:

According to the Arch Wiki (https://wiki.archlinux.org/index.php/GTK%2B) and 
GTK+ 3 reference manual 
(https://developer.gnome.org/gtk3/stable/GtkSettings.html#GtkSettings--gtk-icon-theme-name),
 we should use the key "gtk-icon-theme-name" to set the icon theme for the 
applications that use GTK+ 3 (for example: mousepad).
Also, the default value of this key is "Adwaita". That means GTK+ 3 will search 
the icon from "Adwaita" icon theme if this key is missing in the configuration 
file so we do not need to set something likes "gtk-icon-theme-name = "Adwaita"" 
in the file.
(P.S. should we put "Adwaita" icon theme in the Recommended list for the GTK+ 3 
package?)

Also, according to the "Icon Theme specification" 
(http://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html), 
the "hicolor" icon theme should be available. (Refer to the Directory Layout 
section of the specification):

In order to have a place for third party applications to install their icons 
there should always exist a theme called "hicolor" [1]. The data for the 
hicolor theme is available for download at: 
http://www.freedesktop.org/software/icon-theme/. Implementations are required 
to look in the "hicolor" theme if an icon was not found in the current theme.
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