I just tested it.
Cleared the #fanficcover field and ran an 'overwrite always' on a fic that had a cover image in the first chapter (do you need the link?)
It did populate #fanficcover, but with "DownloadedDownloaded." I'm not sure if that's a mistake in my config (unchanged since the last I posted) or somewhere else (something unintentionally duplicating the values?). edit: as mentioned in post below, regex issue.
If any use, the cover image bit in #fanficmetadata read like this:
Code:
<p><span class='label'>Cover_Image</span>: <div class='metadata' id='cover_image'>first</div><p>
I noticed it took maybe a few seconds longer to update than I usually expected but nothing too much unreasonable.
I also got a DownloadedDownloaded when doing "update if new chapters" on a fic with no cover image (generated cover). I think this is on account of the 'old' cover_image.
This shouldn't be too much of a problem in
practice. Either I edit the regex to exclude 'old,' and/or use custom_columns_settings to apply only to new books.
edit: further tests below