• Fix bug where you could paste into a readOnly editor
• Show a cursor at the drop location when dragging over the editor
• The Rust mode was
  rewritten to handle modern Rust
• The editor and theme CSS was cleaned up. Some selectors are now
  less specific than before
• New theme: abcdef
• Lines longer than maxHighlightLength
  are now less likely to mess up indentation
• New addons: autorefresh
  for refreshing an editor the first time it becomes visible, and html-lint for using HTMLHint
• The search
  addon now recognizes \r and \n in pattern and replacement input