Is "bzr push" safe?

[Martin Pool]

Hi Patrick,

What this is referring to is that pushing a per-task (eg per-bug)
branch over the mainstream branch will cause a change to the mainline
of trunk.  No data is lost, but the graph of revisions will be
presented differently and this may be disturbing.

You can set append_revisions_only to avoid this happening and we
probably should make that option the default.

-- 
Martin