src/vs/platform/extensionManagement/node/extensionManagementService.ts/ExtensionManagementService/unsetUninstalledAndGetLocal
class ExtensionManagementService:	private async unsetUninstalledAndGetLocal(identifierWithVersion: ExtensionIdentifierWithVersion): Promise<ILocalExtension | null> {
		const isUninstalled = await this.isUninstalled(identifierWithVersion);
		if (!isUninstalled) {
			return null;
		}

		this.logService.trace('Removing the extension from uninstalled list:', identifierWithVersion.id);
		// If the same version of extension is marked as uninstalled, remove it from there and return the local.
		const local = await this.extensionsScanner.setInstalled(identifierWithVersion);
		this.logService.info('Removed the extension from uninstalled list:', identifierWithVersion.id);

		return local;
	}