Add option to force placeholder height from item

[Aaron-P]

Adds the option to force the placeholder to use the height of the dragged item.

[Quatoor]

Please add this:

// This is executed after the placeholder has been moved.
@->    afterMove: function ($placeholder, container) Line 49
@+>    afterMove: function ($placeholder, container, item)...

movePlaceholder: function  (container, item, method, sameResultBox) { Line 321
      var lastAppendedItem = this.lastAppendedItem
      if(!sameResultBox && lastAppendedItem && lastAppendedItem[0] === item[0])
        return;
      item[method](this.placeholder)
      this.lastAppendedItem = item
      this.sameResultBox = sameResultBox
      @->  this.options.afterMove(this.placeholder, container)
      @+>  this.options.afterMove(this.placeholder, container, this.item)
}

<style> li.placeholder { margin: 5px!important; padding: 5px!important; border: 1px dashed #999!important } </style>

for ex:

afterMove: function (placeholder, container, item) {
            $(placeholder).height(item.height());
            or
            $(placeholder).height(item.outerHeight());
...

[johnny]

just save the currently dragged item inside the onDragStart callback.