merge method
Implementation
ZefyrThemeData merge(ZefyrThemeData other) {
return copyWith(
bold: other.bold,
italic: other.italic,
underline: other.underline,
strikethrough: other.strikethrough,
link: other.link,
paragraph: other.paragraph,
heading1: other.heading1,
heading2: other.heading2,
heading3: other.heading3,
lists: other.lists,
quote: other.quote,
code: other.code,
);
}