When writing in a text area using the wikitext editor on Flow, a link to lean wikitext is provided inside the text area.
Currently, the link tries to open in the current window which is not very useful: the user gets a message warning that she is going to leave the page and has two options (a) leave the page losing the current text, or (b) remain in the page without learning how to use wikitext.
Since the link is providing in the editing environment, opening it in a new tab by default would be the expected behaviour to avoid data los and unnecessary prompting the user.