Warning
gtk_action_set_gicon has been deprecated since version 3.10 and should not be used in newly-written code. Use GAction instead, and g_menu_item_set_icon() to set an
icon on a GMenuItem associated with a GAction, or gtk_container_add() to
add a GtkImage to a GtkButton
Sets the icon of action.
Since 2.16
Warning gtk_action_set_gicon has been deprecated since version 3.10 and should not be used in newly-written code. Use GAction instead, and g_menu_item_set_icon() to set an icon on a GMenuItem associated with a GAction, or gtk_container_add() to add a GtkImage to a GtkButton Sets the icon of action. Since 2.16