Add form change checking to Gradebook setup page

Visit a course. Add a few assignments. Click on 'Grades' under 'Course administration'. Add a new grade category Click on 'Simple view' under 'Setup' (it's called 'Categories and items' in 2.7 and 2.6). Change the aggregation method to 'Mean of grades (with extra credits)'. Change one of the input fields under 'Extra credit' (do not click save). Click on the course short name in the navigation. Check that there is a pop-up warning you that there is unsaved data. Refresh the page Select a grade item (last checkbox in the table) Click on a link to leave the page Make sure the pop-up warning does not appear Go back, and select a grade item then move it to another category using the select box at the bottom Make sure the pop-up warning does not appear Repeat on the 'Full view' page