src/vs/workbench/browser/actions/layoutActions.ts/ToggleActivityBarVisibilityAction/constructor
class ToggleActivityBarVisibilityAction:	constructor() {
		super({
			id: ToggleActivityBarVisibilityAction.ID,
			title: {
				value: localize('toggleActivityBar', "Toggle Activity Bar Visibility"),
				mnemonicTitle: localize({ key: 'miShowActivityBar', comment: ['&& denotes a mnemonic'] }, "Show &&Activity Bar"),
				original: 'Toggle Activity Bar Visibility'
			},
			category: CATEGORIES.View,
			f1: true,
			toggled: ContextKeyExpr.equals('config.workbench.activityBar.visible', true),
			menu: {
				id: MenuId.MenubarAppearanceMenu,
				group: '2_workbench_layout',
				order: 4
			}
		});
	}