Adds the `isLast` property to item views that are the last in the collection. Takes care of the case where a new item is added to the end, such that the previous last item also updates.
Removes a duplicate listener on ‘selectstart’ events. It is handled separately in the code below.
Disables the selectstart catch all for the unit tests, but doesn’t unload all event handling which can cause exceptions when trying to do event testing.
Turns the TestRunner unit test name into a clickable link to open the direct test in another window/tab. This makes it easy to go to a particular unit test that needs more work in order to debug more effectively without having to remember the special path.