I missed :
https://developer.gnome.org/gtkmm/stable/classGtk_1_1Widget.html#a3a373b58ed5a05fd28d6dadd70d8f39b
And : https://git.gnome.org/browse/gtk+/tree/gtk/gtkbutton.c?h=gtk-3-8
I solve my problem with :
void Timeline::on_size_allocate(Gtk::Allocation &allocation)
{
Gtk::Bin::on_size_allocate(allocation);
// instead of
//get_child()->set_allocation(allocation);
// use
get_child()->size_allocate(allocation);
}
Now, the child of the Gtk::Bin assume all widgets :-)
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