[flutter_tools] Fix so that the value set by --dart-define-from-file can be passed to Gradle (#114297)

* Add dartDefineConfigJsonMap to the checklist

* Fix typo

* Align formatting with other code

* Fix toGradleConfig method

packages/flutter_tools/lib/src/build_info.dart

@@ -334,17 +334,15 @@ class BuildInfo {
         '-P$projectArg',
     ];
     if (dartDefineConfigJsonMap != null) {
-      final List<String> items = <String>[];
+      final Iterable<String> gradleConfKeys = result.map((final String gradleConf) => gradleConf.split('=')[0].substring(2));
-      for (final String gradleConf in result) {
+      dartDefineConfigJsonMap!.forEach((String key, Object value) {
-        final String key = gradleConf.split('=')[0].substring(2);
+        if (gradleConfKeys.contains(key)) {
-        if (dartDefineConfigJsonMap!.containsKey(key)) {
           globals.printWarning(
               'The key: [$key] already exists, you cannot use gradle variables that have been used by the system!');
         } else {
-          items.add('-P$key=${dartDefineConfigJsonMap?[key]}');
+          result.add('-P$key=$value');
         }
-      }
+      });
-      result.addAll(items);
     }
     return result;
   }

packages/flutter_tools/test/general.shard/build_info_test.dart

@@ -230,6 +230,7 @@ void main() {
       treeShakeIcons: true,
       trackWidgetCreation: true,
       dartDefines: <String>['foo=2', 'bar=2'],
+      dartDefineConfigJsonMap: <String, Object>{'baz': '2'},
       dartObfuscation: true,
       splitDebugInfoPath: 'foo/',
       extraFrontEndOptions: <String>['--enable-experiment=non-nullable', 'bar'],
@@ -252,6 +253,7 @@ void main() {
       '-Pcode-size-directory=foo/code-size',
       '-Pfoo=bar',
       '-Pfizz=bazz',
+      '-Pbaz=2',
     ]);
   });
 
@@ -317,7 +319,7 @@ void main() {
           dartObfuscation: true,
       );
       buildInfo.toGradleConfig();
-      expect(testLogger.warningText, contains('he key: [dart-defines] already exists, you cannot use gradle variables that have been used by the system'));
+      expect(testLogger.warningText, contains('The key: [dart-defines] already exists, you cannot use gradle variables that have been used by the system'));
     });
 
     testUsingContext('toGradleConfig repeated variable with not set', () async {
@@ -330,7 +332,7 @@ void main() {
           dartObfuscation: true,
       );
       buildInfo.toGradleConfig();
-      expect(testLogger.warningText, contains('he key: [dart-defines] already exists, you cannot use gradle variables that have been used by the system'));
+      expect(testLogger.warningText, contains('The key: [dart-defines] already exists, you cannot use gradle variables that have been used by the system'));
     });
 
     testUsingContext('toGradleConfig with androidProjectArgs override gradle project variant', () async {
@@ -342,7 +344,7 @@ void main() {
           dartObfuscation: true,
       );
       buildInfo.toGradleConfig();
-      expect(testLogger.warningText, contains('The key: [applicationId] already exists, you cannot use gradle variables that have been used'));
+      expect(testLogger.warningText, contains('The key: [applicationId] already exists, you cannot use gradle variables that have been used by the system'));
     });
 
   });