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 [type_func@Gtk.IconTheme.get_for_display].
name of icon theme to use instead of configured theme, or %NULL to unset a previously set custom theme
See Implementation
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 [type_func@Gtk.IconTheme.get_for_display].