ABackTop works abnormally under Keep-Alive

[gaokun]

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

Version

1.7.3

Environment

MacOS 10.13.4, Chrome 87.0.4280.141, Vue 2.6.10

Reproduction link

Steps to reproduce

Please see codesandbox link

What is expected?

ABackTop is invisible

What is actually happening?

ABackTop is still visible

[gaokun]

I would like to add activated to handle scroll in BackTop, sounds good?

like:

activated() {
    this.$nextTick(() => {
      this.handleScroll();
    });
}

[John60676]

Wellcome PR

[gaokun]

@John60676
PR submitted.

If approved, I think we need to do same in next branch.

[John60676]

done

[github-actions]

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