This feature request is to position cursor at appropriate place i.e. the corresponding place where the mouse pointer is clicked over the preview of the post.
This would be helpful while asking the question and more helpful while editing long post (or post that contain long piece of code).
I created a gif(not a great one, but learn't to create a gif to demonstrate this ;)) to explain this. If we click at point A the cursor should be placed at the
<?php line in the text-area, if mouse pointer is clicked at point B, then the cursor should be placed at it's respective position in text-area.