/* @license This file Copyright © Mnemosyne LLC.
   It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
   or any future license endorsed by Mnemosyne LLC.
   License text can be found in the licenses/ folder. */
/* @license This file Copyright © Charles Kerr, Dave Perrett, Malcolm Jarvis and Bruno Bierbaumer
   It may be used under GPLv2 (SPDX: GPL-2.0-only).
   License text can be found in the licenses/ folder. */