DUPLICATE: Undo an unwanted grading
Sometimes my space bar hiccoughs, with the result that a card is graded with 4 instead of the answer shown.
Often I have those cards wrong, but now they won't be shown again for many months!
(1) A way to undo a rash grading; and
(2) A way to regrade any card in the data base.
Duplicate, please vote for https://mnemosyne.uservoice.com/admin/forums/164265-general/suggestions/2901339-undo-last-card-10-work-units