bind drag events to $document

[hrosenbauer]

$body won't receive mouseup if the cursor is outside the browser window, $document does

Steps to repeat:

• open http://gridster.net/demos/resize.html
• resize the browser window so it isn't in fullscreen mode
• drag a widget and move the cursor outside the window
• release the mouse button
• move the cursor back inside the window
• result: the widget is still dragging until you click

Fix: bind the mouse-events to the document so it will receive the mouseup even if the cursor is outside the browser window - this creates a more native drag-n-drop feeling.

[justinwoo]

You can also reproduce the issue by dragging down fast enough to escape the document.body area. If your document.body isn't big enough of an area to capture the mouse events, you end up the cursor location being lost because it isn't inside the body.

[hrosenbauer]

Pullrequest was merged in dd6c7420087d5810a9f6b02bf9d81a04a60ae840