src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/SetFileIconThemeAction/constructor
class SetFileIconThemeAction:	constructor(
		private fileIconThemes: IWorkbenchFileIconTheme[],
		@IExtensionService extensionService: IExtensionService,
		@IWorkbenchThemeService private readonly workbenchThemeService: IWorkbenchThemeService,
		@IQuickInputService private readonly quickInputService: IQuickInputService
	) {
		super(`extensions.fileIconTheme`, localize('file icon theme', "Set File Icon Theme"), SetFileIconThemeAction.DisabledClass, false);
		this._register(Event.any<any>(extensionService.onDidChangeExtensions, workbenchThemeService.onDidFileIconThemeChange)(() => this.update(), this));
		this.update();
	}