anchor.diff:   * `<c-u>`: scroll half a page up
    * `<c-d>`: scroll half a page down
   
  - * `'`: rotate selections (the main selection becomes the next one)
  - * `<a-'>`: rotate selections backwards
  + * `)`: rotate selections (the main selection becomes the next one)
  + * `(`: rotate selections backwards
   
    * `;`: reduce selections to their cursor
    * `<a-;>`: flip the selections' direction
  
positive.code: 
   * `<a-.>`: repeat last object or `f`/`t` selection command.
  
  
  A word is a sequence of alphanumeric characters or underscore, a WORD is a
  sequence of non whitespace characters.
  
negative.code:  * `<a-@>`: convert spaces to tabs in current selections, uses the buffer
              tabstop option or the count parameter for tabstop.
  
   * `<a-)>`: rotate selections content, if specified, the count groups
              selections, so `3<a-">` rotate (1, 2, 3) and (3, 4, 6)
              independently.
   * `<a-(>`: rotate selections content backwards
  
  Goto Commands
  ~~~~~~~~~~~~~
  