If I have 2 (or more) reply areas open and with text in them, when I submit 1, the other should remain open.
Currently, if I compose 2 replies at once (see screenshot), and click "Reply" to save 1 of them, the other vanishes completely.
At minimum, I should get a warning that I'm going to lose unsaved changes. (I do have the preference checked, for "Warn me when I leave an edit page with unsaved changes"). But really it should just save the 1st post, and leave the 2nd open for further editing. It used to do this.