Draggable: Containment can be broken when scrolling while dragging

[bugsBuggy]

[22:53] <dogarrhea2> i just installed chrome 5 minutes ago
[22:53] <dogarrhea2> change your browser size to something where a scrollbar on the right shows up.
[22:53] <dogarrhea2> drag the element that is "contained in parent etc." towards the part of the screen which will cause a scroll.
[22:55] <dogarrhea2> for those of you trying to follow along, it's at http://jqueryui.com/demos/draggable/constrain-movement.html for the "contained in parent" draggable
[22:55] <dogarrhea2> you can actually drag it outside if your window is resized. 
[22:55] <Eviltwin> Not sure anyone is trying to follow along :P
[22:55] <dogarrhea2> were you able to replicate Eviltwin?
[22:55] <Eviltwin> Yeah, I didn't realize you needed to make the window scroll
[22:55] <Eviltwin> Missed that part
[22:57] <Eviltwin> I'm guessing this is to account for a scrolling parent element
[22:57] == mariuscc [~mariuscc@79.112.120.98] has joined #jquery
[22:58] == VeggieMeat [~veggiemea@64.19.101.243] has joined #jquery
[22:58] <Eviltwin> Well report it to jQuery UI devs

[bugsBuggy]

Explanation of irc log:

Dragging a draggable element which has containment is totally broken when the entire page scrolls while the dragging is in effect. This can actually be seen in the link provided above (to the actual demo page where it is broken)at ​http://jqueryui.com/demos/draggable/constrain-movement.html

[Scott González]

#8412 is a duplicate of this ticket.

[mikesherov]

Confirmed as described: ​http://jqueryui.com/draggable/#constrain-movement

1. Click and drag the "I'm contained within my parent" element to the bottom of its parent.
2. While still dragging the element, scroll the iframe down.
3. move the mouse slightly while still dragging.
4. observe the element jumping out of the containment.

It may take a few times to get it... it's a quite fickle set of repro steps.

[mikesherov]

This works and was fixed in 1.10.3