a-table组件页面自定义fixed列后，有scroll情况下正常，无scroll情况下宽度不匹配

[Kim1am]

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

Version

1.6.4

Environment

vue: 2.6.11,

Reproduction link

Steps to reproduce

1、每一列固定宽度
2、所有列宽度不足a-table总宽度
3、fixed某一列
即可复现

What is expected?

当所有列宽度不足a-table总宽度时（无scroll），fixed固定的某一列，应继承原有a-table的width auto-width。而不是单独width
当width综合超过a-table宽度是不会出现该bug

What is actually happening?

fixed列后，出现空隙。经确认：fixed列宽度 = colums设置width。而table宽度对应的colums宽度时width auto-width（自适应宽度）。从而导致宽度不匹配的空隙出现

[tangjinzhou]

留一列不设置宽度自适应

[Kim1am]

留一列不设置宽度自适应

您好，如果我需要配合拖拽+列固定的话，这样是不是会有问题？因为fixed列是根据colums原始设定的width展现的，如果拖拽后，再进行fixed，那是否有问题？

[github-actions]

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