anchor.diff:   * +nop+: does nothing, but as with every other commands, arguments may be
         evaluated. So nop can be used for example to execute a shell command
         while being sure that it's output will not be interpreted by kak.
  -      :%sh{ echo echo tchou } will echo tchou in kakoune, wherease
  -      :nop %sh{ echo echo tchou } will not, but both will execute the
  +      +:%sh{ echo echo tchou }+ will echo tchou in kakoune, whereas
  +      +:nop %sh{ echo echo tchou }+ will not, but both will execute the
         shell command.
   
   String syntax
  
positive.code: 
  Filters can be installed to interact with buffer modifications. They can be
  added or removed with
  -----------------------------------------------
  :addfilter <filter_name> <filter_parameters...>
  -----------------------------------------------
  and
  ---------------------
  :rmfilter <filter_id>
  ---------------------
  
negative.code: accessed through %reg{<register>} and %opt{<option>} syntax.
  
  for example you can display last search pattern with
  
  -------------
  :echo %reg{/}
  -------------
  