removeGroup method
Implementation
void removeGroup(String groupId) {
_update((v) => v.copyWith(
groups: v.groups.where((g) => g.id != groupId).toList(),
));
}
void removeGroup(String groupId) {
_update((v) => v.copyWith(
groups: v.groups.where((g) => g.id != groupId).toList(),
));
}