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GObject
╰── GInitiallyUnowned
╰── GtkWidget
╰── GtkContainer
╰── GtkBin
╰── DzlBin
├── DzlDockRevealer
├── DzlDockOverlayEdge
├── DzlDockWidget
╰── DzlTab
This is just a GtkBin class that also allows for various styling with CSS over what can be done in GtkBin directly.