Table 开启了 pagination.showSizeChanger 后，修改分页大小触发两次 onChange 事件

[sendya]

• I have searched the issues of this repository and believe that this is not a duplicate.

Version

1.1.6

Environment

Windwos 10 1803, Chrome 70, Vue 2.5.17

Reproduction link

Steps to reproduce

Table 组件开启

pagination: {
    showSizeChanger: true,
},

之后。修改分页大小

What is expected?

只触发一次 onChange

What is actually happening?

会导致 Table 的 onChange 事件触发两次

[github-actions]

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