Collapse plugin not finding trigger when targeting a class or multipl…

Created by: Xabis

When a collapse panel is targeting either a class or a comma separated list of ids, the trigger's class and aria attributes are not updated.

Use case 1, "class":

<ul>
   <li>item</li>
   <li>item</li>
   <li>item</li>
   <li class="mylist collapse">item</li>
   <li class="mylist collapse">item</li>
   <li class="mylist collapse">item</li>
</ul>
<button type="button" data-toggle="collapse" data-target=".mylist">show/hide</button>

Use case 2, "multliple ids":

<ul id="mylist1">
   <li>item</li>
   <li>item</li>
   <li>item</li>
</ul>
<ul id="mylist2">
   <li>item</li>
   <li>item</li>
   <li>item</li>
</ul>
<button type="button" data-toggle="collapse" data-target="#mylist1,#mylist2">show/hide all</button>