Fired when a link is clicked in the preview editor. Opens a new external browser instance with the URL opened or opens certain supported files (like other markdown files) in the editor.

HACK: Using .RunSync to allow for sync method: Possible lock up scenario IMPORTANT: Use the async version if possible. This version exists solely for callbacks from WebView in order to be able to return a value as WebView doesn't support async results properly yet.

public bool PreviewLinkNavigation(string url, string src)