"Delete CSV File From Server" re-processes import

After completing an import, immediately pressing "Delete CSV File From Server" runs the import again. (At first I thought it was simply erroneously duplicating the "Successfully imported # nodes" message but then I realised the nodes were duplicated as well ... only after proceeding to Delete though.)

Returning to admin/content/node_import and selecting "Use a Different File" removes the file and re-presents the "Upload File" box as expected.

Oh, refreshing the page after import also re-processes the import (I'd expect a relocation after the import has proceeded to avoid such an occurance), but that's really a separate issue.