Remove stripping scriptCodes for localization. (#83903)

packages/flutter_localizations/lib/src/utils/date_localizations.dart

@@ -16,29 +16,9 @@ bool _dateIntlDataInitialized = false;
 /// invocations have no effect.
 void loadDateIntlDataIfNotLoaded() {
   if (!_dateIntlDataInitialized) {
-    // TODO(garyq): Add support for scriptCodes. Do not strip scriptCode from string.
-
-    // Keeps track of initialized locales. This can only happen if a locale
-    // with a stripped scriptCode has already been initialized. The set of
-    // initialized locales should be removed when scriptCode stripping is
-    // removed.
-    final Set<String> initializedLocales = <String>{};
     date_localizations.dateSymbols
       .cast<String, Map<String, dynamic>>()
       .forEach((String locale, Map<String, dynamic> data) {
-        // Strip scriptCode from the locale, as we do not distinguish between scripts
-        // for dates.
-        final List<String> codes = locale.split('_');
-        String? countryCode;
-        if (codes.length == 2) {
-          countryCode = codes[1].length < 4 ? codes[1] : null;
-        } else if (codes.length == 3) {
-          countryCode = codes[1].length < codes[2].length ? codes[1] : codes[2];
-        }
-        locale = codes[0] + (countryCode != null ? '_$countryCode' : '');
-        if (initializedLocales.contains(locale))
-          return;
-        initializedLocales.add(locale);
         // Perform initialization.
         assert(date_localizations.datePatterns.containsKey(locale));
         final intl.DateSymbols symbols = intl.DateSymbols.deserializeFromMap(data);

packages/flutter_localizations/test/material/date_time_test.dart

@@ -158,6 +158,23 @@ void main() {
         expect(formatted[DateType.full], 'Mittwoch, 1. August 2018');
         expect(formatted[DateType.monthYear], 'August 2018');
       });
+
+      testWidgets('formats dates in Serbian', (WidgetTester tester) async {
+        final Map<DateType, String> formatted = await formatDate(tester, const Locale('sr'), DateTime(2018, 8, 1));
+        expect(formatted[DateType.year], '2018.');
+        expect(formatted[DateType.medium], 'сре 1. авг');
+        expect(formatted[DateType.full], 'среда, 1. август 2018.');
+        expect(formatted[DateType.monthYear], 'август 2018.');
+      });
+
+      testWidgets('formats dates in Serbian (Latin)', (WidgetTester tester) async {
+        final Map<DateType, String> formatted = await formatDate(tester,
+          const Locale.fromSubtags(languageCode:'sr', scriptCode: 'Latn'), DateTime(2018, 8, 1));
+        expect(formatted[DateType.year], '2018.');
+        expect(formatted[DateType.medium], 'sre 1. avg');
+        expect(formatted[DateType.full], 'sreda, 1. avgust 2018.');
+        expect(formatted[DateType.monthYear], 'avgust 2018.');
+      });
     });
   });