Accidental selection of a task

Sometimes I go a little too fast while I'm trying to delete tasks and actually select a task that I did not want. We need an option to undo that selection. For instance you're deleting 120 point tasks cuz you're only selecting 320 tasks and you accidentally select a 120 task that you did not want. Need to find a way to undo that task without having to delete it and lose the task.