Posting in StackOverFlow isn't visual. Users have to fetch what it will look like and have to post. So, please add a feature of visual editing (Like Wordpress).
closed as unclear what you're asking by Robert Longson, S.L. Barth, curiousdannii, Shadow Wizard, Ward Jan 22 '18 at 14:13
Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.
For me the current editor and preview are enough.
I do understand you won't be a markdown master from the start, but you don't need to. The toolbar helps you to learn the markdown language, and even if you don't learn the syntax, still the preview will show you what the end result was.
You seem to be asking for a WYSIWYG editor. There is no added value for such editor. Often I find those working not too well.