Sets the name of the icon theme that the #GtkIconTheme object uses overriding system configuration. This function cannot be called on the icon theme objects returned from gtk.icon_theme.IconTheme.getDefault and gtk.icon_theme.IconTheme.getForScreen.
name of icon theme to use instead of configured theme, or null to unset a previously set custom theme
Sets the name of the icon theme that the #GtkIconTheme object uses overriding system configuration. This function cannot be called on the icon theme objects returned from gtk.icon_theme.IconTheme.getDefault and gtk.icon_theme.IconTheme.getForScreen.