fix: avoid race condition when opening side channel

[javier-godoy]

The current implementation for opening and switching to a new browser window was causing intermittent test failures (flakiness).

testbench-rpc/src/main/java/com/flowingcode/vaadin/testbench/rpc/HasRpcSupport.java

Lines 276 to 278 in 1f7c5a4

	((JavascriptExecutor) driver).executeScript("open(arguments[0],arguments[1])",
	sideChannelUrl, sideChannelName);
	driver.switchTo().window(sideChannelName);

The code was executing window.open() via JavaScript and immediately attempting to switchTo().window(). Because window.open() is handled asynchronously by the browser's UI thread, the WebDriver command to switch would often reach the browser before the browser had finished registering the new window handle.

Result: Selenium would throw an exception because the window name did not exist yet in the session's window list at the server side.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud