Dragging item to edge doesn't scroll parent #430

Hello.

Thanks for all of your work on this codebase. I've come across a strange situation where dragging a li doesn't cause the page to scroll up, even when the li gets near the top of the page. I tried adding a helper function but it's really choppy. Here is what I'm passing for options:

galleryCtrl.sortableGalleries = { 'ui-floating': true, 'handle' : '.drag', stop: orderGalleries, disableSelection: true, scrollSpeed: 1, scrollSensitivity: 160, containment: "parent" };

Is there anything that I could have done in the HTML / CSS that would break scrolling? We're using Flexbox.

Thanks again,
Matt