HTML output doesn't honour indentation of attributes

[asilano]

ReActionView is removing leading whitespace from lines which contain just an HTML attribute. This is totally valid HTML, but makes reading the rendered output much less pleasant (as well as messing up test snapshots when migrating from Erubi to ReActionView).

I assume this is ReActionView, rather than Herb, because the Herb formatter is not changing the indentation; it only happens on the rendered output.

Given the following template file:

<div>
  <div
    class="foo"
    role="dialog"
    aria-role="dialog"
    id="fooDlg"
    data-colour="chartreuse"
  >
    <p>Bar</p>
  </div>
</div>

Expected

The rendered HTML output should match - it should be:

Erubi output

<div>
  <div
    class="foo"
    role="dialog"
    aria-role="dialog"
    id="fooDlg"
    data-colour="chartreuse"
  >
    <p>Bar</p>
  </div>
</div>

Actual

The attributes get outdented back to column 0:

ReActionView output

<div>
  <div
class="foo"
role="dialog"
aria-role="dialog"
id="fooDlg"
data-colour="chartreuse"
>
    <p>Bar</p>
  </div>
</div>