After upgrading from 1.12.1 to 1.13.0 dragging an item to a sortable causes the helper to go out of page when it is over the sortable.

The code to create the draggable is below.

	$('#widgets .available-widgets .widget-panel').draggable({
			helper: 'clone',
			distance: 10,
			connectToSortable: '.widget-area',
		});

Same code works fine on 1.12.1. Feel free to close if this is already reported since I saw some other issues with draggable on 1.13.0