src/vs/workbench/services/extensions/electron-sandbox/cachedExtensionScanner.ts/CachedExtensionScanner/startScanningExtensions
class CachedExtensionScanner:	public async startScanningExtensions(): Promise<void> {
		try {
			const { system, user, development } = await this._scanInstalledExtensions();
			const r = dedupExtensions(system, user, development, this._logService);
			this._scannedExtensionsResolve(r);
		} catch (err) {
			this._scannedExtensionsReject(err);
		}
	}