Event leave sometimes is called when I start dragging file

[mitchenkod]

Hello!

I am using dragster and have noticed a weird thing. I have dragster binded on the body tag and I need to show a shadow on the full browser window, when I am dragging in some files. And after drop or dragging files out I need to hide it. But, sometimes when I take file and dragging them in the window, the event drag leave is called. It looks like a blink of shadow, after I start dragging in something.

Here is, how it happens on the project demo page - I've just took a file and dragged it in the drop zone, then I've made a screenshot. You see, that not only drag enter event is called, but drag enter and drag leave and then drag enter again.
Chrome and Mozilla browsers.

Do you have any idea how to solve it? Thanks.