Propagate mouseup events when not dragging toolbar

In Chrome (this does not affect Firefox) onchange events on multi-selects are not fired all of the time e.g. with the following template:

<body>
    <select multiple="multiple" onchange="console.log('clicked');">
        <option  value="1">1</option>
    </select>
</body>

Ctrl click on the option and view the js log. many of the events will not register. Therefore stop propagation and prevent default action only when handle is dragged.
Merge pull request #553 from djsutho/patch-1

Propagate mouseup events when not dragging toolbar