Column and header alignment breaks with fixed header (scroll.y)

[funkindy]

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

Version

1.4.7

Environment

Windows 10, Chrome 78, Vue 2.6.10

Reproduction link

Steps to reproduce

1. Put the a-table to the component
2. set scroll.y to 'auto' or any other number

What is expected?

Expecting the table header widths aligned with the column widths, as well as the working y scroll.

What is actually happening?

Table header widths break in unpredictable manner:

---

"Playing" with column`s widths doesnt help. (Ive tried to left 1 ore more columns without withds set but doesnt help)

[leslieeilsel]

Specify the width of columns if header and cell do not align properly.

[funkindy]

@leslieeilsel I've mentioned in the issue that playing with column`s widths doesnt help unfortunately.

[leslieeilsel]

@leslieeilsel I've mentioned in the issue that playing with column`s widths doesnt help unfortunately.
like this？

[funkindy]

@leslieeilsel Thanks. That helped. Ive did exactly the same thing but with lower values, e.g. 150/75. Now i see how it works, thanks. Looks like table header doesnt support overflow.

[github-actions]

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