src/vs/platform/userDataSync/common/settingsSync.ts/SettingsSynchroniser/getIgnoredSettings
class SettingsSynchroniser:	private async getIgnoredSettings(content?: string): Promise<string[]> {
		if (!this._defaultIgnoredSettings) {
			this._defaultIgnoredSettings = this.userDataSyncUtilService.resolveDefaultIgnoredSettings();
			const disposable = Event.any<any>(
				Event.filter(this.extensionManagementService.onDidInstallExtensions, (e => e.some(({ local }) => !!local))),
				Event.filter(this.extensionManagementService.onDidUninstallExtension, (e => !e.error)))(() => {
					disposable.dispose();
					this._defaultIgnoredSettings = undefined;
				});
		}
		const defaultIgnoredSettings = await this._defaultIgnoredSettings;
		return getIgnoredSettings(defaultIgnoredSettings, this.configurationService, content);
	}