fix ArgumentOutOfRangeException when richtextfield._textChanged is true #242
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修复 #241 这个issue所描述的问题
RichTextField/TextField在OnUpdate的时候触发了OnSizeChanged, 到上层需要BatchUpdate的节点执行SetRenderingOrder时,因为此时的_textChanged是true, 所以会在
Rect rect = child.GetBounds(initiator);
时触发EnsureSizeCorrect(),将所有的同级节点都移除,导致
count发生了变化,但是这里的值时旧的,会 throw OutOfRange Exception