Do not refresh a container when form input was changed or a form element is focused

Listen for changes in form elements and abort all reloads that contain a form with
at least one changed form element. Do not refresh containers that contain a focused form
element, except of elements with autofocus, to preserve form elements with a dropdown.
Only focus autofocus elements when there is currently no other selection.

refs #7146
refs #5537
fixes #7162