This is a bugfix version. Recommended for all users.

* Fixed: Window moving/resizing is very slow.
* Fixed: Crash if the document window is moved/resized when preview is
  loading.
* Fixed: Background glitch at the bottom of the editor is scrolled very
  quickly to the bottom.
* Fixed: HTML copy when preview is hidden yields incorrect results.
* Fixed: URLs in image constructs (`![]()`) are highlighted as links.
* Fixed: Preview does not refresh with MathJax on if the Internet is
  slow or unavailable.
* Enhancement: Reject files that cannot be decoded with UTF-8.