hasChangedMentionType method Null safety
Implementation
MentionType? hasChangedMentionType() {
if (oldValues == null || oldValues?['mention_type'] == null) {
return null;
}
final oldMentionType =
MentionType.values.byName(oldValues?['mention_type']);
return oldMentionType != mentionType ? mentionType : null;
}