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()
    return
  end
  -- maximize window
  -- 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)
end
function source.initialize_default_settings()
  local font_height = 20
  love.graphics.setFont(love.graphics.newFont(font_height))
  local em = App.newText(love.graphics.getFont(), 'm')
  source.initialize_window_geometry(App.width(em))
  Editor_state = edit.initialize_state(Margin_top, Margin_left, App.screen.width-Margin_right)
  -- maximize window to determine maximum allowable dimensions
  App.screen.resize(0, 0)  -- maximize
  Display_width, Display_height, App.screen.flags = App.screen.size()
  -- set up desired window dimensions
  App.screen.flags.resizable = true
  App.screen.flags.minwidth = math.min(Display_width, 200)
  App.screen.flags.minheight = math.min(Display_height, 200)
  App.screen.width, App.screen.height = settings.width, settings.height
--?   print('setting window from settings:', App.screen.width, App.screen.height)
  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
end
function source.set_window_position_from_settings(settings)
  end
end
function source.resize_window_from_settings(settings)
  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()
    return
  end
  source.resize_window_from_settings(settings)
--?   print('loading source position', settings.x, settings.y, settings.displayindex)
  source.set_window_position_from_settings(settings)
  Show_log_browser_side = settings.show_log_browser_side
  local right = App.screen.width - Margin_right
  if Show_log_browser_side then
    right = App.screen.width/2 - Margin_right
  end
  Editor_state = edit.initialize_state(Margin_top, Margin_left, right, settings.font_height, math.floor(settings.font_height*1.3))
  Editor_state.filename = settings.filename

    Settings.x, Settings.y, Settings.displayindex = App.screen.position()
  end
  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
end
function run.resize(w, h)
--?   print(("Window resized to width: %d and height: %d."):format(w, h))
  App.screen.width, App.screen.height = w, h
  Text.redraw_all(Editor_state)
  Editor_state.selection1 = {}  -- no support for shift drag while we're resizing
  Editor_state.right = App.screen.width-Margin_right
  Editor_state.width = Editor_state.right-Editor_state.left
  Text.tweak_screen_top_and_cursor(Editor_state, Editor_state.left, Editor_state.right)
end
  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*em_width
  App.screen.flags.resizable = true
  App.screen.flags.minwidth = math.min(App.screen.width, 200)
  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()
    return
  end
  -- maximize window
  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
  App.screen.move(Settings.x, Settings.y, Settings.displayindex)
  Editor_state = edit.initialize_state(Margin_top, Margin_left, App.screen.width-Margin_right, Settings.font_height, math.floor(Settings.font_height*1.3))
  Editor_state.filename = Settings.filename
  Editor_state.screen_top1 = Settings.screen_top
  Editor_state.cursor1 = Settings.cursor
end
function run.initialize_default_settings()
  local font_height = 20
  love.graphics.setFont(love.graphics.newFont(font_height))
  local em = App.newText(love.graphics.getFont(), 'm')
  run.initialize_window_geometry(App.width(em))
  Editor_state = edit.initialize_state(Margin_top, Margin_left, App.screen.width-Margin_right)
  Editor_state.font_height = font_height
  Editor_state.line_height = math.floor(font_height*1.3)
  Editor_state.em = em
  Settings = run.settings()
end
function run.initialize_window_geometry(em_width)
  App.screen.width, App.screen.height, App.screen.flags = App.screen.size()
  -- set up desired window dimensions

  App.screen.width, App.screen.height, App.screen.flags = love.window.getMode()

  App.screen.width, App.screen.height, App.screen.flags = App.screen.size()

  love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)
  love.window.setPosition(settings.x, settings.y, settings.displayindex)

  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)
  App.screen.move(settings.x, settings.y, settings.displayindex)

  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()
    return
  end

  love.window.setMode(0, 0)  -- maximize
  App.screen.width, App.screen.height, App.screen.flags = love.window.getMode()

  App.screen.resize(0, 0)  -- maximize
  App.screen.width, App.screen.height, App.screen.flags = App.screen.size()

  love.window.setMode(App.screen.width, App.screen.height, App.screen.flags)

  App.screen.resize(App.screen.width, App.screen.height, App.screen.flags)

  local x,y,displayindex = love.window.getPosition()

  local x,y,displayindex = App.screen.position()

    filename = love.filesystem.getUserDirectory()..'/lines.txt',  -- '/' should work even on Windows