3.21.0

• Auto-indenting a block will no longer add trailing whitespace to blank lines.
• Marking text has a new option clearWhenEmpty to control auto-removal.
• Several bugfixes in the handling of bidirectional text.
• The XML and CSS modes were largely rewritten. LESS support was added to the CSS mode.
• The OCaml mode was moved to an mllike mode, F# support added.
• Make it possible to fetch multiple applicable helper values with getHelpers, and to register helpers matched on predicates with registerGlobalHelper.
• New theme pastel-on-dark.
• Better ECMAScript 6 support in JavaScript mode.
• Full list of patches.