revision history could retain a delete-restore pair

As a teacher, I appreciate the ability to see text and squiggles that have been deleted. Confidently saying I can look at revision history usually prevents students from testing limits. If a student deletes something and I restore it, the revision history after restoring is modified incorrectly; it removes the student’s deletion from the revision history and shows as if I have “edited” the item at the time that I selected “restore”.