Test the behavior of the file-storage when a malicious user would try to store a pre-existing file on the server as its ownThe fix for the file-storage is a simple validation to make sure that the tmpfile exists, however, for the generic case of the file widget, we cannot trust the tmpfile value when this was not generated by the server. This will probably cause regression when one wants to show a "preview" of a form, to be continued.
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