GtkWindow::set_transient_for
void set_transient_for(GtkWindow
parent);
Sets parent as the transient parent of the window.
Setting a transient parent helps the window manager to relate two windows
to each other. In most cases, dialogs should have a transient parent
window so that the window manager knows where to position the dialog
window.
参照:
get_transient_for() ,
set_destroy_with_parent()