ReferenceError: isAntBtn is not defined

[jervainy]

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

Version

1.5.0-rc.4

Environment

macOS Catalina 10.15.3 chrome 80.0.3987.132 vue 2.6.11

Reproduction link

Steps to reproduce

xxxx

What is expected?

按钮有一个气泡确认框，当按钮不可用时气泡确认框点击后没有内容

What is actually happening?

APopconfirm里使用AButton，将AButton的属性设置为true，会导致AButton直接从页面中消失

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1.5.0-rc.3同样存在这样的问题

[tangjinzhou]

ref #1890

[github-actions]

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