* Fixed: Endless recursion on editor bound changes, causing editor to
  flicker and/or application crash.
* Fixed: Auto link detection misjudges certain patterns as links and
  cannot be turned off.
* Fixed: Contents in `<script>` and `<style>` HTML tags are treated as
  text by the word counter.
* Fixed: ⌘← jumps to *logical* line start instead of *visual* left end
  of line.
* Fixed: List item auto-completion misjudges tab indents.
* Enhancement: Experimental table of content support.
* Enhancement: Revised “Hide Preview Panel” behaviour.
* Enhancement: Editor-preview ratio can now be restored after preview
  is hidden.
* Enhancement: Files can now be saved in arbitrary extensions.
* Enhancement: Pressing tab when selecting text now acts the same as
  ⌘].
* Enhancement: Replace `:` and `/` with `-` when auto-detecting file
  names.
* Various bug fixes and minor enhancement.