Weird problem with type hint Dock and configure-event.

[Magicloud Magiclouds <magicloud magiclouds gmail com>]

Hi,
  Recently, I found that, if I inherit Gtk::Window class, and set the
type hint to dock in initialize, the configure-event could be
triggered correctly. But, if I directly use Gtk::Window class, new it,
set the type hint to dock, then the configure-event would not be
triggered at all.
  Why it works like this?
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