src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/SetFileIconThemeAction/constructor
class SetFileIconThemeAction:	constructor(
		@IExtensionService extensionService: IExtensionService,
		@IWorkbenchThemeService private readonly workbenchThemeService: IWorkbenchThemeService,
		@IQuickInputService private readonly quickInputService: IQuickInputService,
		@IWorkbenchExtensionEnablementService private readonly extensionEnablementService: IWorkbenchExtensionEnablementService,
	) {
		super(SetFileIconThemeAction.ID, SetFileIconThemeAction.TITLE.value, SetFileIconThemeAction.DisabledClass, false);
		this._register(Event.any<any>(extensionService.onDidChangeExtensions, workbenchThemeService.onDidFileIconThemeChange)(() => this.update(), this));
		this.update();
	}