merge method
Implementation
ZeroAppBarStyle merge(ZeroAppBarStyle? other) {
if (other == null) return this;
return copyWith(
backgroundColor: other.backgroundColor,
foregroundColor: other.foregroundColor,
height: other.height,
titleStyle: titleStyle?.merge(other.titleStyle) ?? other.titleStyle,
centerTitle: other.centerTitle,
statusBarBrightness: other.statusBarBrightness,
elevation: other.elevation,
shadowColor: other.shadowColor,
titleSpacing: other.titleSpacing,
);
}