Custom "style" attributes removed

[luke-]

When change the style attributes of a RichText Field directly in the source code view they are removed.

[buddh4]

Steps to reproduce?

[luke-]

To reproduce:

• Open a Richtext Element (HTML)
• Switch to HTML/Sourcecode View
• Add a Table in Source

e.g.

<table class="table table-striped">
  <thead>
    <tr>
      <th scope="col">#</th>
      <th scope="col">First</th>
      <th scope="col">Last</th>
      <th scope="col">Handle</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
      <td>@mdo</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
      <td>@fat</td>
    </tr>
    <tr>
      <th scope="row">3</th>
      <td>Larry</td>
      <td>the Bird</td>
      <td>@twitter</td>
    </tr>
  </tbody>
</table>

• Save
• Anything works as expected
• Now, when you open the Element in Editor, all custom attributes are removed