src/vs/editor/contrib/linesOperations/linesOperations.ts/MoveLinesDownAction/constructor
class MoveLinesDownAction:	constructor() {
		super(true, {
			id: 'editor.action.moveLinesDownAction',
			label: nls.localize('lines.moveDown', "Move Line Down"),
			alias: 'Move Line Down',
			precondition: EditorContextKeys.writable,
			kbOpts: {
				kbExpr: EditorContextKeys.editorTextFocus,
				primary: KeyMod.Alt | KeyCode.DownArrow,
				linux: { primary: KeyMod.Alt | KeyCode.DownArrow },
				weight: KeybindingWeight.EditorContrib
			},
			menuOpts: {
				menuId: MenuId.MenubarSelectionMenu,
				group: '2_line',
				title: nls.localize({ key: 'miMoveLinesDown', comment: ['&& denotes a mnemonic'] }, "Move &&Line Down"),
				order: 4
			}
		});
	}