class FOutlinerSpacer : public [UE::Sequencer::FViewModel](API\Editor\SequencerCore\MVVM\ViewModels\FViewModel), public [UE::Sequencer::FGeometryExtensionShim](API\Editor\SequencerCore\MVVM\Extensions\FGeometryExtensionShim), public [UE::Sequencer::FOutlinerExtensionShim](API\Editor\SequencerCore\MVVM\Extensions\FOutlinerExtensionShim), public [UE::Sequencer::ISortableExtension](API\Editor\SequencerCore\MVVM\Extensions\ISortableExtension), public [UE::Sequencer::IOutlinerDropTargetOutlinerExtension](API\Editor\SequencerCore\MVVM\Extensions\IOutlinerDropTargetOutlinerExten-)