src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/InstallDropdownAction/constructor
class InstallDropdownAction:	constructor(
		@IInstantiationService instantiationService: IInstantiationService,
		@IExtensionsWorkbenchService extensionsWorkbenchService: IExtensionsWorkbenchService,
	) {
		super(`extensions.installActions`, '', [
			[
				instantiationService.createInstance(InstallAndSyncAction, extensionsWorkbenchService.preferPreReleases),
				instantiationService.createInstance(InstallAndSyncAction, !extensionsWorkbenchService.preferPreReleases),
			],
			[
				instantiationService.createInstance(InstallAction, extensionsWorkbenchService.preferPreReleases),
				instantiationService.createInstance(InstallAction, !extensionsWorkbenchService.preferPreReleases),
			]
		]);
	}