anchor.diff:          .grid-item= i
     pre: code
       | .grid-2-up
  -    |  .grid-item Content
  -    |  //- ...
  +    |   .grid-item Content
  +    |   //- ...
   
   article.sg-component
     h3 Three-up Grid
  
positive.code:         .grid-item= i
    pre: code
      | .grid-4-up
      |  .grid-item Content
      |  //- ...
  
  article.sg-component
    h3 Nested Grids
  
negative.code:         .grid-item= i
    pre: code
      | .grid-3-up
      |   .grid-item Content
      |   //- ...
  
  article.sg-component
    h3 Four-up Grid
  