.panel-collapse with .list-group-item.active adds border radius

Created by: zacechola

jsbin: http://jsbin.com/wumoyi/1/edit?html,output

.list-group-item:first-child and .list-group-item:last-child removes the borders, but they're added back in by ..panel>.panel-collapse>.list-group:last-child .list-group-item:last-child and it's first-child companion.

This doesn't seem to happen in a normal panel with a list group.

The reason isn't jumping out at me right now. 😧