Method Shuffle

src/music_gui.cpp:207–221

* Enable shuffle mode. */

 * Enable shuffle mode.
 */
void MusicSystem::Shuffle()
{
	_settings_client.music.shuffle = true;

	uint set_index = this->GetSetIndex();
	this->active_playlist = this->standard_playlists[this->selected_playlist];
	for (size_t i = 0; i < this->active_playlist.size(); i++) {
		size_t shuffle_index = InteractiveRandom() % (this->active_playlist.size() - i);
		std::swap(this->active_playlist[i], this->active_playlist[i + shuffle_index]);
	}
	this->SetPositionBySetIndex(set_index);

	InvalidateWindowData(WC_MUSIC_TRACK_SELECTION, 0);
	InvalidateWindowData(WC_MUSIC_WINDOW, 0);
}

/**
 * Disable shuffle mode.