function run.file_drop(file)

function App.keychord_pressed(chord, key)

  -- ignore events for some time after window in focus (mostly alt-tab)

    return
  end
  --
  if chord == 'C-e' then
    -- carefully save settings
    if Current_app == 'run' then
      local source_settings = Settings.source
      Settings = run.settings()
      Settings.source = source_settings
      if run.quit then run.quit() end
      Current_app = 'source'
    elseif Current_app == 'source' then
      Settings.source = source.settings()
      if source.quit then source.quit() end
      Current_app = 'run'
    else
      assert(false, 'unknown app "'..Current_app..'"')
    end
    Settings.current_app = Current_app
    love.filesystem.write('config', json.encode(Settings))
    -- reboot
    load_file_from_source_or_save_directory('main.lua')
    App.undo_initialize()
    App.run_tests_and_initialize()
    return

    if run.keychord_pressed then run.keychord_pressed(chord, key) end

  elseif Current_app == 'source' then

    if source.keychord_pressed then source.keychord_pressed(chord, key) end

  else
    assert(false, 'unknown app "'..Current_app..'"')