IIRC, it could happen if you have a SubmitButton and you, in addition, explicitly call form.submit() from a ClickHandler attached to the SubmitButton (which is useless, but not harmless in this case: one of the 2 submits –SubmitButton default action, and explicit form.submit()– is not cancellable). Other than that (a coworker was in the process of replacing Button+form.submit with SubmitButton but forgot to remove the ClickHandler), I've never faced that issue.
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