User can safely call addRequestFilter/addResponseFilter with the same filter

[asolntsev]

The problem

Every time when I call open(url) in my tests, I want to add a proxy filter.
But Selenide doesn't allow adding multiple filters with the same name.
So I need to add an IF like this:

open();
if (getSelenideProxy().requestFilter("request-logger") == null) {
  getSelenideProxy().addRequestFilter("request-logger", MY_LOGGER);
}

Solution

Method addRequestFilter could silently ignore without throwing an error IF the filter is exactly the same instance as previously.
Then I could safely add getSelenideProxy().addRequestFilter("request-logger", MY_CONSTANT_LOGGER); all over my tests.