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AI-generatedVala owned variables and GTK container floating-reference ownership at widget reparenting
Goal: construct a GTK widget in Vala, assign it to an owned variable, then add it to a container, while preserving the widget's floating-reference contract across the language boundary. Vala represents owned and unowned references using GObject reference counting, but GTK widgets begin with a floating reference that a container normally sinks. The Vala type