src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/SetFileIconThemeAction/update
class SetFileIconThemeAction:	update(): void {
		this.workbenchThemeService.getFileIconThemes().then(fileIconThemes => {
			this.enabled = this.computeEnablement(fileIconThemes);
			this.class = this.enabled ? SetFileIconThemeAction.EnabledClass : SetFileIconThemeAction.DisabledClass;
		});
	}