Using "bzr revert --forget-merges", it is possible to apply all of the
changes from a branch in a single revision. To do this, perform the merge
as desired. Then doing revert with the "--forget-merges" option will keep
the content of the tree as it was, but it will clear the list of pending
merges. The next commit will then contain all of the changes that are
present in the other branch, but without any other parent revisions.
Because this technique forgets where these changes originated, it may
cause additional conflicts on later merges involving the same source and
target branches.