图例翻页有时计算错误 #3873

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Steps to reproduce

legend，maxRow: 2，position: right，分页数有21页，翻页时图例从18页直接跳到了第一页，但是随着容器变化有时候17也就不会有这个问题，说不定总页数有多少的时候就会出现这个问题； <img width="168" alt="L1VzZXJzL3poYW95b25nY2hhby9MaWJyYXJ5L0FwcGxpY2F0aW9uIFN1cHBvcnQvRGluZ1RhbGtNYWMvNjczNDI4MDJfdjIvSW1hZ2VGaWxlcy8xNjQ5OTE2OTIxNzkxX0Y3NDEzNjk0LUNCMjEtNDA3RC1CNjNGLUE0M0ZFOUJFQzAxNi5wbmc=" src="https://user-images.githubusercontent.com/57588659/163327667-2b77b500-23e6-441a-af35-fd20ea1fcdfa.png"> <img width="163" alt="L1VzZXJzL3poYW95b25nY2hhby9MaWJyYXJ5L0FwcGxpY2F0aW9uIFN1cHBvcnQvRGluZ1RhbGtNYWMvNjczNDI4MDJfdjIvSW1hZ2VGaWxlcy8xNjQ5OTE2OTIyNjEwXzA1ODQxRkY3LTY2NDUtNDcxMy04M0MxLTMyMjAwOEE3QTMzNC5wbmc=" src="https://user-images.githubusercontent.com/57588659/163327685-708e6828-382d-4042-b464-3924e6e1df08.png">

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