fix issue #3 列表项添加点击跳转到其他页面之后回来, 下拉菜单就不会弹出了 #4
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原因: 跳转到其他页面的时候会重复调用 didChangeDependencies , 导致添加多个 listener , 回到页面之后点击时会重复触发点击事件, 开启 => 关闭
This was referenced Aug 14, 2019
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原因: 跳转到其他页面的时候会重复调用 didChangeDependencies , 导致添加多个 listener , 回到页面之后点击时会重复触发点击事件, 开启 => 关闭