Commit
https://git.gnome.org/browse/gtkmm/commit/?id=a502d27364572430c2deb3f0a56cbfb0e5c48a19
adds
//TODO: Maybe keep this or implement it ourselves,
//because the C API now requires manual ref/unrefing to stop remove()
and add() from breaking things.
I didn't think of that complication when I deprecated
Widget::reparent(). It's an issue only for managed widgets, such as
Gtk::Button* button1 = Gtk::manage(new Gtk::Button());
Other widgets have a reference count > 0 even when they are not inserted
in a Gtk::Container.
How about just adding to the deprecation message that the
Container::remove()/Container::add() combination can't be used with
managed widgets? Would that be an acceptable restriction?
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