[asset] Include assets in input files (#83416)

packages/flutter_tools/lib/src/asset.dart

@@ -365,6 +365,7 @@ class ManifestAssetBundle implements AssetBundle {
       }
       for (final _Asset variant in assetVariants[asset]) {
         final File variantFile = variant.lookupAssetFile(_fileSystem);
+        inputFiles.add(variantFile);
         assert(variantFile.existsSync());
         entries[variant.entryUri.path] ??= DevFSFileContent(variantFile);
       }

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

@@ -54,6 +54,7 @@ void main() {
           packagesPath,
           globals.fs.path.join(dataPath, 'font', 'pubspec.yaml'),
           manifestPath,
+          globals.fs.path.join(dataPath, 'font', 'test_font_file'),
         ],
       );
     });