src/vs/platform/extensionManagement/node/extensionsScanner.ts/ExtensionsScanner/setUninstalled
class ExtensionsScanner:	async setUninstalled(...extensions: ILocalExtension[]): Promise<void> {
		const ids: ExtensionIdentifierWithVersion[] = extensions.map(e => new ExtensionIdentifierWithVersion(e.identifier, e.manifest.version));
		await this.withUninstalledExtensions(uninstalled => {
			ids.forEach(id => uninstalled[id.key()] = true);
		});
	}