Given I am creating a new multipe choice quesetion
And I set the "Question name" to "Example"
When I press "Blanks for 3 more choices"
And I follow "Site home"
Then I should see the form change checker
However I am navigated away from the page
We need to extend the check in lib/formslib.php::startForm() to add $this->isSubmitted(), i.e.
This will ensure that a form which was submitted, but rejected, is marked as dirty.