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As mentioned in this comment, couldn't you assign to
App.grub_devicehere and let the loop naturally exit?There was a problem hiding this comment.
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Sorry, I am not familiar with this project and only discovered this issue while using the program. And even after repeating this logic three times, the program still runs normally, so the length of
App. grub_deviceseems insignificant? Even though it was 0, the backup operation was still performed normally, so I used the simplest repair method