Here is code i have in editor
<a href="https://localhost:25682/wp-content/uploads/2015/07/TextHash.png" data-rel="lightbox"> <img src="https://localhost:25682/wp-content/uploads/2015/07/TextHash.png" title="Checksum calculator for text" alt="Checksum calculator for text" class="so-widget-image" style="max-width:100%; height:auto; display:block" height="324" width="747">
</a>
and here is what i get in firefox page inspector after editor update and page reload
<a href="https://localhost:25682/wp-content/uploads/2015/07/TextHash.png"> <img src="https://localhost:25682/wp-content/uploads/2015/07/TextHash.png" title="Checksum calculator for text" alt="Checksum calculator for text" class="so-widget-image" style="max-width:100%; height:auto; display:block" height="324" width="747">
</a>
