Craga89

// Create new object to cache iframe offsets
$.ui.ddmanager.frameOffsets = {};
 
// Override the native `prepareOffsets` method. This is almost
// identical to the un-edited method, except for the last part!
$.ui.ddmanager.prepareOffsets = function (t, event) {
    var i, j,
        m = $.ui.ddmanager.droppables[t.options.scope] || [],
        type = event ? event.type : null, // workaround for #2317
        list = (t.currentItem || t.element).find(":data(ui-droppable)").addBack(),