Since Sigil is sometimes unstable, it would be nice to be able to do an immediate save, even if the epub is not correct. In this case, Sigil could prompt 'Do you really want to save an illegal epub?'. If the user responds yes, Sigil could save as ??.epub-wip. Then if ??.epub is opened, and a ??.epub-wip exists and is more recent, Sigil could prompt to see which the user wishes to open.
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