a suggestion: mark the lessons on which I've already earned the Full Heart Bonus
I have been going back to old lessons to see if I can get them perfectly right now that I have learned more. As a bonus, I get the "full heart bonus" and a lingot when I do. However, Duolingo doesn't mark the lessons on which I have already earned this, creating the risk that I repeat one of these exercises rather than moving on to something new. Would it be possible to mark the lessons on which the "full heart" bonus has already been earned?