notmuch reindex wipes existing tags

[David Bremner]

Franz Fellner <alpine.art.de at gmail.com> writes:

>
> And it fails. The tag "attachments-extracted" got removed.
> Got curious, it seems as soon as the additional tag starts with "attachment"
> "notmuch reindex" removes it.
> With "extracted-attachments" everything is fine.
> Thought it might clash with preserved tags.
> But "unreadable" and "inboxable" works just fine.
> So it has to do with special handling of "attachment".

Thanks for this. I suspected there might be something funny there (since
the tag 'attachment' is handled specially), but I didn't know how. Now I
know where to look.

David