merge method
Implementation
ZeroAvatarStyle merge(ZeroAvatarStyle? other) {
if (other == null) return this;
return copyWith(
backgroundColor: other.backgroundColor,
badgeColor: other.badgeColor,
borderColor: other.borderColor,
initialColor: other.initialColor,
initialStyle:
initialStyle?.merge(other.initialStyle) ?? other.initialStyle,
);
}