Public bug reported:

Merging multiple djvu files should not be a lossy operation, apart from
metadata that only has 1 slot (e.g. author, title, etc).  The bookmarks
(aka outline) is lost, not merged:

$ djvused -e 'print-outline' file-a.djvu

(bookmarks
 ("foo"
  "#1" ) )

$ djvused -e 'print-outline' file-b.djvu

(bookmarks
 ("bar"
  "#1" ) )

$ djvm -c mergetest.djvu file-a.djvu file-b.djvu

$ djvused -e 'print-outline' mergetest.djvu

(no output)

This data loss is also undocumented.  While it wouldn't be necessary to
document obvious unavoidable data loss such as doc-wide fields of author
and title, the loss of bookmarks is due to an incomplete implementation.
And it's unexpected.  So this should either be fixed, or the man page
should be updated perhaps with a BUGS section warning users of the data
loss.

** Affects: djvulibre (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1935689

Title:
  djvm loses bookmarks on merges with -create

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