[Monaco]Fix Json format preview setting (#36867)

src/common/FilePreviewCommon/Formatters/FilePreviewJsonSerializerContext.cs

@@ -7,7 +7,6 @@ using System.Text.Json.Serialization;
 
 namespace Microsoft.PowerToys.FilePreviewCommon.Monaco.Formatters;
 
-[JsonSourceGenerationOptions(WriteIndented = true)]
 [JsonSerializable(typeof(JsonDocument))]
 internal sealed partial class FilePreviewJsonSerializerContext : JsonSerializerContext
 {

src/common/FilePreviewCommon/Formatters/JsonFormatter.cs

@@ -14,9 +14,12 @@ namespace Microsoft.PowerToys.FilePreviewCommon.Monaco.Formatters
 
         private static readonly JsonSerializerOptions _serializerOptions = new JsonSerializerOptions
         {
+            WriteIndented = true,
             Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
         };
 
+        private static readonly FilePreviewJsonSerializerContext _filePreviewJsonSerializerContext = new(_serializerOptions);
+
         /// <inheritdoc/>
         public string Format(string value)
         {
@@ -27,8 +30,7 @@ namespace Microsoft.PowerToys.FilePreviewCommon.Monaco.Formatters
 
             using (var jDocument = JsonDocument.Parse(value, new JsonDocumentOptions { CommentHandling = JsonCommentHandling.Skip }))
             {
-                FilePreviewJsonSerializerContext context = new(_serializerOptions);
+                return JsonSerializer.Serialize(jDocument, _filePreviewJsonSerializerContext.JsonDocument);
-                return JsonSerializer.Serialize(jDocument, context.JsonDocument);
             }
         }
     }