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+GtkOffscreenWindow
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+A toplevel container widget for doing offscreen rendering of children
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+The #GtkOffscreenWindow container is a top-level container that is used
+to manage offscreen rendering and snapshot retrieval of the widget that
+is contained inside it.
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+GtkOffscreenWindow was introduced in GTK+ 2.20.
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+@offscreen:
+@Returns:
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+@offscreen:
+@Returns:
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