dropdown-menu button's menu renders outside browser window

[inactivist]

I'm relatively new to Twitter BS and encountered an odd effect with dropdown buttons. The popup menu renders outside the window/viewport, clipping the popup (and thus rendering it pretty much unusable.) The appearance is very similar to the one described in issue #3107.

JSFiddle example - screen shot:

Consider the following (admittedly unusual) floating div structure:

<div class="pull-left">
    <div class="pull-right">
        <div class="btn-group">                 
                <a class="btn btn-mini dropdown-toggle" data-toggle="dropdown" href="#">
                    <span>Actions</span>
                    <span class="caret"></span>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">Item 1</a></li>
                    <li><a href="#">Item 2</a></li>
                    <li><a href="#">Item 3</a></li>
                    <li class="divider"></li>
                    <li><a href="#">Item 4</a></li>
                    <li><a href="#">Item 5</a></li>
                </ul>
            </div>
    </div>
</div>

Patient: "Doctor, it only hurts when I laugh."
Doctor: "Then don't laugh."

I'll admit that I might want to avoid the nested pull-right / pull-left structure, but... is this reasonable behavior from Bootstrap?

I'm using Bootstrap v2.0.3.

[inactivist]

Workaround: Substitute style="float:left" and style="float:right" for pull-left and pull-right classes, respectively.

Here's a JSFiddle example.

<div style="float:left;">
    <div style="float:right;">
        <div class="btn-group">                 
                <a class="btn btn-mini dropdown-toggle" data-toggle="dropdown" href="#">
                    <span>Actions</span>
                    <span class="caret"></span>
                </a>
                <ul class="dropdown-menu">
                    <li><a href="#">Item 1</a></li>
                    <li><a href="#">Item 2</a></li>
                    <li><a href="#">Item 3</a></li>
                    <li class="divider"></li>
                    <li><a href="#">Item 4</a></li>
                    <li><a href="#">Item 5</a></li>
                </ul>
         </div>
    </div>
</div>

[mdo]

We currently do not do anything for positioning elements off screen, but this brings up another bug: we shouldn't be floating the menu like that given the float is on an element above the .btn-group. I've fixed this in 2.0.4-wip.

[Bapu09]

What about this? How can I do that?
http://jsfiddle.net/Acchg/241/z