src/vs/workbench/browser/parts/views/viewPaneContainer.ts/ViewPaneContainer/orientation
class ViewPaneContainer:	private get orientation(): Orientation {
		switch (this.viewDescriptorService.getViewContainerLocation(this.viewContainer)) {
			case ViewContainerLocation.Sidebar:
			case ViewContainerLocation.AuxiliaryBar:
				return Orientation.VERTICAL;
			case ViewContainerLocation.Panel:
				return this.layoutService.getPanelPosition() === Position.BOTTOM ? Orientation.HORIZONTAL : Orientation.VERTICAL;
		}

		return Orientation.VERTICAL;
	}