Fix #1216 from previous PR #1217 - #1293

Description

From @annayafi in #1216:

The problem was : when you call addClassToAnchors(el, buttonClass) function :

• if el is an <a> : no problem, it adds the css class(es)
• if el has <a> children : no problem, it adds the css class(es) to children
• if el is a child of an <a> : the function never looks for parent and won't add the css class(es).
  This happens very easily when you select more than a node, for example you select exactly <i>hello</i>, css is never added.

This PR wraps up #1216 by fixing some spacing issues and resolving a bug in the code. Thanks again @annayafi for opening the issue and fixing it! (Sorry for the massive delay in getting your fix merged!)