Revert to previous template::widget::file behavior of accepting input in a form of a list of 3 elements (e.g. without a .tmpfile in the requ…
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Revert to previous template::widget::file behavior of accepting input in a form of a list of 3 elements (e.g. without a .tmpfile in the request), but introduce validation so that we enforce all widget values to be in the proper format and the files to be "safe"
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