message: cleanup: merge hack of empty slate not needed anymore
diff: @@ -257,15 +257,9 @@ function createOnKeyDown(
  mergeWithPrevious(previous => {
  const value = Value.fromJSON(previous)
  const selection = CoreRange.create(editor.value.selection)
  - return (
  - editor
  - // hack because empty slate looses focus
  - .insertTextAtRange(selection, ' ')
  + return editor
  .insertFragmentAtRange(selection, value.document)
  - .moveFocusBackward(1)
  - .delete()
  .value.toJSON()
  - )
  })
  }
  return
  