This item is still under review by the feature team. I have no details as to when a decision might happen.
74 votesPrashant Pathak commented
The WYSIWYG markdown hybrid currently implemented is very fiddly to use to the point that I just avoid it altogether. It was ambitious but unfortunately a failure. Time to accept that and move on. The point of Markdown is that the raw syntax itself looks close enough to the desired output that you can edit in it directly. I suggest scrapping the in-line formatting and showing a side-by-side preview if the user adds any markdown to the message. I think this would more convenient than a separate preview tab (like on GitHub). Also acceptable would be a button (with a keyboard shorcut) that you hold down to see the preview.