attachment_add compared every attachment name, including files attached to pages as comments, so a page comment with the same file name made the reported key empty. It now compares only the document-level name-tree keys. Deleting the last document attachment when the catalog's /Names is an indirect dictionary left an empty /Names behind; it is now removed from the catalog, as the direct case already did.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
