Extra indentation when typing a rendering macro

To reproduce:

• Type "{{groovy}}" & press enter
• Type "{{/groovy}}" & press enter

You'll end up with:

{{groovy}}
  {{/groovy}}

Which isn't nice.

In addition all our usages of rendering macro don't add an indentation. We should align to that an stop indenting.

Right now it's painful and everytime I edit I curse the syntax highlighting....