Because the IContainer interface is API, we can't simply rename the methods to match the ones that are used by GEF. Instead, a new DesignerContainer class is created, which serves as an adapter between the IContainer interface and the PaletteDrawer class.
The IContainer interface has been marked as deprecated and "for removal", meaning that they can be removed after a two-year grace period, without breaking API.
Because the IContainer interface is API, we can't simply rename the methods to match the ones that are used by GEF. Instead, a new DesignerContainer class is created, which serves as an adapter between the IContainer interface and the PaletteDrawer class.
The IContainer interface has been marked as deprecated and "for removal", meaning that they can be removed after a two-year grace period, without breaking API.