Asking a user to confirm the correctness of input either from the system or from the user themselves

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Which approach is better for Delete confirmation when the operation may fail?

I'm developing an Android application where I have entities A and sub-entities B. An A can have multiple Bs associated with it. (There's a database check for referential integrity). I'm planning to ...
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File rename treating loss of focus as “undo” - why?

You're in the middle of renaming a file from file manager, nautilus or whatever, and you alt-tab to another app. When you alt-tab back, it's forgotten what you typed. This happens on most versions ...