Adds widget to container. Typically used for simple containers
such as GtkWindow, GtkFrame, or GtkButton; for more complicated
layout containers such as GtkBox or GtkTable, this function will
pick default packing parameters that may not be correct. So
consider functions such as gtk_box_pack_start() and
gtk_table_attach() as an alternative to gtk_container_add() in
those cases. A widget may be added to only one container at a time;
you can't place the same widget inside two different containers.
Adds widget to container. Typically used for simple containers such as GtkWindow, GtkFrame, or GtkButton; for more complicated layout containers such as GtkBox or GtkTable, this function will pick default packing parameters that may not be correct. So consider functions such as gtk_box_pack_start() and gtk_table_attach() as an alternative to gtk_container_add() in those cases. A widget may be added to only one container at a time; you can't place the same widget inside two different containers.