function tryCopyFromParents(newLines, annotations)
  local pat = "^ *([^ ]+) +(%d+) +(%d+)"
  pid2ann = {}
  for i=1, #newLines do
    if annotations[i] ~= nil and annotations[i] ~= '' then
      local _, _, user, pid, ppid = newLines[i]:find(pat)
      if pid then
        pid2ann[pid] = annotations[i]
        --print("pid2ann", pid, annotations[i])
      end
    end
  end

  for i=1, #newLines do
    if annotations[i] == nil or annotations[i] == '' then
      local _, _, user, pid, ppid = newLines[i]:find(pat)
      if ppid then
        annotations[i] = pid2ann[ppid]
      end
    end
  end
end