readme.md

Drupal's bootstrap theme converts Drupal's fieldsets into Bootstrap panels, but sadly doesn't include any kind of indication in the panel header that they are collapsible/expandible.

This nifty bit of sass will let you add a dropdown icon to the title:

<span class="glyphicon glyphicon-chevron-down pull-right"></span>

And have it animate when you expand/collapse the panel.

To use, simply override bootstrap-panel.tpl.php and throw that in just after the title is printed inside of the <?php if ($collapsible): ?>

bootstrap-panel chevron.scss

.panel-title {
  .glyphicon.pull-right {
    line-height: inherit;
  }

  .glyphicon-chevron-down {
    transition: transform 0.6s ease 0s;
    transform: rotateX(180deg);
  }

  &.collapsed .glyphicon-chevron-down {
    transform: rotateX(0deg);
  }
}