if App.any_modifier_down() then
    if App.key_down(t) then
      -- The modifiers didn't change the key. Handle it in keychord_press.
      return
    else
      -- Key mutated by the keyboard layout. Continue below.
    end

  -- textinput events can occur on chords with the shift key or AltGr key
  -- but not for ctrl, alt or cmd/super/gui
  if App.ctrl_down() or App.alt_down() or App.cmd_down() then
    return

  if App.any_modifier_down() then
    if App.key_down(t) then
      -- The modifiers didn't change the key. Handle it in keychord_press.
      return
    else
      -- Key mutated by the keyboard layout. Continue below.
    end

  -- textinput events can occur on chords with the shift key or AltGr key
  -- but not for ctrl, alt or cmd/super/gui
  if App.ctrl_down() or App.alt_down() or App.cmd_down() then
    return

* `App.any_modifier_down()` -- returns `true` if any of the modifier keys is
  currently pressed.

function App.any_modifier_down()
  return App.ctrl_down() or App.alt_down() or App.shift_down() or App.cmd_down()

-- Many keyboard layouts use a special altGr key to insert additional
-- printable characters. SDL/LÖVE can't represent altGr distinctly.
function alt_gr_down()
  return App.key_down('ralt')

-- altGr is a separate modifier and never considered with alt or ctrl,
-- regardless of layout.

  if alt_gr_down() then return false end

  if alt_gr_down() then return false end

  Only left alt is supported, because many keyboard layouts use right alt like
  shift for typing characters, and I don't know how to figure out the current
  layout.