driver.manage().window().setSize does not work in private mode

[agabrys]

The following code does not work in private mode:

Window window = driver.manage().window();
window.setPosition(new Point(0, 0));
window.setSize(new Dimension(width, height));

The code which creates drivers:

DesiredCapabilities capabilities = DesiredCapabilities.operaBlink();
capabilities.setBrowserName("opera");
OperaOptions options = new OperaOptions();
options.addArguments("private");
capabilities.setCapability(OperaOptions.CAPABILITY, options);
WebDriver driver = new OperaDriver(capabilities);

I know that I can pass arguments to drivers using OperaOptions, but I would like to change size during tests executions.

Logs:

Starting OperaDriver 0.2.0 (ba47709ed9e35ce26dbd960fb5d75be104290d96) on port 22946
Only local connections are allowed.
Tests run: 10, Failures: 1, Errors: 0, Skipped: 9, Time elapsed: 4.975 sec <<< FAILURE! - in TestSuite
beforeEachTest(com.hybris.testing.backoffice.login.BackofficeEditProductTest)  Time elapsed: 4.597 sec  <<< FAILURE!
org.openqa.selenium.WebDriverException: unknown error: No current window
JavaScript stack:
Error: No current window
    at checkForExtensionError (chrome-extension://aapnijgdinlhnhlmodcfapnahmbfebeb/background.js:14:17)
    at Object.callback (chrome-extension://aapnijgdinlhnhlmodcfapnahmbfebeb/background.js:67:5)
    at safeCallbackApply (extensions::sendRequest:21:15)
    at handleResponse (extensions::sendRequest:72:7)
  (Session info: Opera with embedded Chromium 49.0.2623.87)
  (Driver info: OperaDriver=0.2.0 (ba47709ed9e35ce26dbd960fb5d75be104290d96),platform=Windows NT 10.0 x86_64) (WARNING: The server did not provide any stacktrace information)
Command duration or timeout: 37 milliseconds

The same error occurred in Chrome (see Issue 1350).

[agabrys]

I'm temporary solved this by code:

driver.get("chrome://extensions");
WebElement checkbox = driver.findElement(By.xpath("//div[contains(@class, 'incognito-control')]/label/input[@type='checkbox']"));
if (!checkbox.isSelected()) {
    checkbox.click();
}

The solution is based on code added to comment of the Issue 513.