* `Font_height` -- remembers the current font height on initialization. But
  you're responsible for setting it when updating font height. (Think of this
  as the body font, but apps so far assume a single font size.)

  Font_height = 20

  load_settings()

  if love.filesystem.getInfo('config') then
    load_settings()
  else
    initialize_default_settings()
  end

  if love.filesystem.getInfo('config') then
    local settings = json.decode(love.filesystem.read('config'))
    local width, height, flags = App.screen.size()
    flags.resizable = true
    flags.minwidth = math.min(width, 200)
    flags.minheight = math.min(height, 200)
    App.screen.flags = flags
    App.screen.width = settings.width
    App.screen.height = settings.height
    App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
    App.screen.move(settings.x, settings.y, settings.displayindex)
    if on.load_settings then on.load_settings(settings.app) end
  else
    Font_height = 20
    love.graphics.setFont(love.graphics.newFont(Font_height))
    local os = love.system.getOS()
    if os == 'Android' or os == 'iOS' then
      -- maximizing on iOS breaks text rendering: https://github.com/deltadaedalus/vudu/issues/7
      -- no point second-guessing window dimensions on mobile
      App.screen.width, App.screen.height, App.screen.flags = App.screen.size()
    else
      -- maximize window
      App.screen.resize(0, 0)  -- maximize
      App.screen.width, App.screen.height, App.screen.flags = App.screen.size()
      -- shrink height slightly to account for window decoration
      App.screen.height = App.screen.height-100
      App.screen.width = 40*App.width('m')
      App.screen.flags.resizable = true
      App.screen.flags.minwidth = math.min(App.screen.width, 200)
      App.screen.flags.minheight = math.min(App.screen.height, 200)
      App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
    end
    if on.load_settings then on.load_settings() end
  end

  local settings = json.decode(love.filesystem.read('config'))
  _, _, App.screen.flags = App.screen.size()
  App.screen.flags.resizable = true
  App.screen.width, App.screen.height = settings.width, settings.height
  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
  set_window_position_from_settings(settings)
  if on.load_settings then on.load_settings(settings.app) end

  -- set up desired window dimensions and make window resizable
  _, _, App.screen.flags = App.screen.size()
  set_window_position_from_settings(settings)

function set_window_position_from_settings(settings)
  local os = love.system.getOS()
  if os == 'Linux' then
    -- love.window.setPosition doesn't quite seem to do what is asked of it on Linux.
    App.screen.move(settings.x, settings.y-37, settings.displayindex)
  else
    App.screen.move(settings.x, settings.y, settings.displayindex)
  end
end
  -- Initialize window width/height and make window resizable.
  --
  -- I get tempted to have opinions about window dimensions here, but they're
  -- non-portable:
  --  - maximizing doesn't work on mobile and messes things up
  --  - maximizing keeps the title bar on screen in Linux, but off screen on
  --    Windows. And there's no way to get the height of the title bar.
  -- It seems more robust to just follow LÖVE's default window size until
  -- someone overrides it.

end
function initialize_default_settings()
  local font_height = 20
  love.graphics.setFont(love.graphics.newFont(font_height))
  initialize_window_geometry(App.width('m'))

function initialize_window_geometry(em_width)

  App.screen.width, App.screen.height, App.screen.flags = App.screen.size()
  App.screen.flags.resizable = true
  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
end