item: increase parent length only if parentSub=null
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				| @ -441,7 +441,7 @@ export class Item { | ||||
|       } | ||||
|     } | ||||
|     // adjust the length of parent
 | ||||
|     if (parent.length !== undefined && this._countable) { | ||||
|     if (parentSub === null && parent.length !== undefined && this._countable) { | ||||
|       parent.length += this._length | ||||
|     } | ||||
|     if (parent._deleted) { | ||||
|  | ||||
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