registerIcon method
Implementation
@override
void registerIcon(NamedIcon icon, {bool? isSolid}) {
_iconMapping[icon.name] = icon;
if (isSolid != true) {
registerIcon(
icon.copyWith(
name: "${icon.name}_solid",
isSolid: true,
iconData: icon.solidData,
solidData: icon.solidData,
color: Colors.white),
isSolid: true);
}
}