plasmid duplication: seqfile remains visible in edit view even when deleted.
Just confusing:
- duplicate a plasmid: we are now in edit view of the new one.
- on this view, if we delete the seqfile, we are prompted for ocnfirmation.
- after confirming, the seqfile is still shown, as if we did not deleted it.
- If we save, then yes, it is deleted. The fact that it is displayed is confusing because users have the impression that deletion won't take effect.