What does it use if not a checkbox?
It can't just show once and never again since the message can be replaced with a higher priority one (IIUC), the user might not even see
it the first time, or even if they do see it, they might just want to dismiss it, to deal with it next time.
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It actually shows the message only once, *except* if it was replaced by a higher priority one.
So it's only shown once if the user clicked it away.
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