Collapsing animation cuts left of content when containing a row

[mijamo]

When the collapsable element is wrapped in a "row" class, the very left part of the element is cut during the animation.

Ex :

<a data-toggle="collapse" data-target="#demo">collapse</a>
<div id="demo" class="collapse in">
<div class="row">
<h1>Some title</h1>
<p>Some content</p>
</div>
</div>

tested with Bootstrap 3 RC1, IE9 &FF22

[cvrebert]

@mijamo Please re-check against the HEAD of 3.0.0-wip; a lot has changed in git since RC 1.

[mdo]

Closing as a dupe of #9077.

[mdo]

Btw, this happens because you're misusing the .row—it's only for use with grid columns. Any content within will be negative indented.