By setting the type hint for the window, you allow the window manager to decorate and handle the window in a way which is suitable to the function of the window in your application.
the window type
This function should be called before the window becomes visible.
gtkDialogNewWithButtons and other convenience functions in GTK+
will sometimes call
gtkWindowSetTypeHint on your behalf.
Derived by RGtkGen from GTK+ documentation
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