Image2: Buggy showblocks integration

[Olek Nowodziński]

1. Open samples/plugins/image2/image2.html
2. Use the following code:

   <figure class="caption" style="float:right"><img alt="Saturn V" src="assets/image1.jpg" width="200" />
   <figcaption>Roll out of Saturn V on launch pad</figcaption>
   </figure>
   

3. Click show blocks.
4. It's simply just DIV.
5. Now use the following code:

   <p style="text-align:center"><img alt="Saturn V" src="assets/image1.jpg" width="200" /></p>
   

6. Click show blocks.
7. Note it's DIV > P. Expected: P.

[Piotrek Koszuliński]

Closing this in favor of more generic #10884.

BTW. Showblock does not show figcaption or figure. So the only issue is that widget wrapper is shown.