phamconganh

need `path` can nullable when `extraAssetLoaders` isNotEmpty for only load localization of subset package

e.g. I have a nullable list ['text', null] and write a safe conversion ``` @JsonKey(fromJson: safeList) List property; ``` ``` List safeList(dynamic value, {List defaultValue = const []}) => safeNullableList(value)...

Need to set focus mode and change focus when scanning, and focus thread may be needed to display touch focus

``` Locale get deviceLocale => _deviceLocale; Locale? get savedLocale => _savedLocale; ``` to ``` static Locale get deviceLocale => _deviceLocale; static Locale? get savedLocale => _savedLocale; ```

### What does it do? Add custom text message text builder. Example build markdown from flutter_markdown Add previewImageBuilder for link preview