merge method
Implementation
ChipThemeData merge(ChipThemeData? style) {
if (style == null) return this;
return ChipThemeData(
decoration: style.decoration ?? decoration,
selectedDecoration: style.selectedDecoration ?? selectedDecoration,
selectedTextStyle: style.selectedTextStyle ?? selectedTextStyle,
cursor: style.cursor ?? cursor,
textStyle: style.textStyle ?? textStyle,
spacing: style.spacing ?? spacing,
);
}