resolve method
This style with every remaining default filled in.
Heading defaults live on GptMarkdownThemeData as h1-h6,
autoAddDividerLineAfterH1 and the hrLine* fields. Anything left null here
keeps using those, so existing themes keep working unchanged.
Implementation
HeadingStyle resolve(ColorScheme scheme) {
return HeadingStyle(
textStyle: textStyle,
padding: padding,
showDivider: showDivider,
dividerColor: dividerColor,
dividerThickness: dividerThickness,
dividerPadding: dividerPadding,
);
}