增加一个递归查找界面元素的方法

[KeyLee123]

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[deepin-ci-robot]

Hi @KeyLee123. Thanks for your PR. 😃

[deepin-ci-robot]

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This pull-request has been approved by: KeyLee123

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[deepin-ci-robot]

Hi @KeyLee123. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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