Cache[id] = {filename=Directory..id, left=0, right=Display_settings.column_width, links={}}

    Cache[id] = {id=id, filename=Directory..id, left=0, right=Display_settings.column_width}

    Cache[id].links = load_links(id)

  -- save symmetric links
  for rel,target in pairs(Cache[pane.id].links) do
    save_links(target)
  end

  -- save the payload

  -- skip other writes in tests
  if App.run_tests then
    return
  end
  --
  save_links(State.id)
  -- update recent

function load_links(id)
  local infile = App.open_for_reading(Directory..id..'.json')
  if infile == nil then
    return {}
  end
  return json.decode(infile:read('*a'))
end
function save_links(id)
  local status = love.filesystem.createDirectory(Directory..dirname(id))
  assert(status)
  local links_filename = Directory..id..'.json'
  local outfile = App.open_for_writing(links_filename)
  if outfile == nil then
    error('failed to write to "'..links_filename..'"')
  end
  outfile:write(json.encode(Cache[id].links))
  outfile:write('\n')
  outfile:close()
end

  App.run_tests = nil