Creating links over whole inline elements creates orphans

[lucthev]

With the following selection:

<p>One |<strong>two</strong>| three</p>

using .link('http://www.example.com') creates an orphaned <strong>:

<p>
  One 
  <strong></strong>
 |<a href="http://www.example.com"><strong>two</strong></a>|
   three
</p>

This is probably because of the custom conversion logic introduced in d54f6f0.

[lucthev]

More generally, it would be nice if orphaned inline elements got removed; when pasting images within anchors, for example (<a href="#"><img src="x.jpg" /></a>, the image gets stripped out, leaving behind an orphaned <a>.