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/*
 * Get the visibility of the equalizer window.
 *
 * Examples:
 *   puts 'equalizer window visible' if remote.equalizer_visible?
 *   puts 'equalizer window visible' if remote.eq_visible?
 *   puts 'equalizer window visible' if remote.equalizer?
 *   puts 'equalizer window visible' if remote.eq?
 *
 */
static VALUE xr_is_eq(VALUE self) {