Draggable improperly blurs in certain cases

[dcherman1]

JSFiddle: ​http://jsfiddle.net/JGw96/

In _mouseCapture occurs in draggable, the first thing is does is blur the activeElement if it's not the body, then it's checking to see whether or not the mousedown event should have been handled in the first place.

In my case, I have a handle defined, so _mouseCapture will end up returning false since it shouldn't handle that specific event. I think that in those cases, the activeElement should not have been blurred.

[mikesherov]

Duplicate of #10527.
That's true, and we fixed this in #10527