[Backport 8.x.x] Fixed a serialization issue, preventing quality level parameters to undo/redo and update scene view on change.

com.unity.render-pipelines.high-definition/CHANGELOG.md

@@ -71,6 +71,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed issue with white flash when enabling SSR.
 - Fix inconsistencies with transparent motion vectors and opaque by allowing camera only transparent motion vectors.
 - Fixed issue with depth pyramid generation and dynamic resolution.
+- Fixed a serialization issue, preventing quality level parameters to undo/redo and update scene view on change.
 
 ### Changed
 - Shadowmask and realtime reflection probe property are hide in Quality settings

com.unity.render-pipelines.high-definition/Editor/RenderPipeline/ScalableSettingLevelParameterEditor.cs

@@ -22,13 +22,14 @@ public override bool OnGUI(SerializedDataParameter parameter, GUIContent title)
             rect.y += 2;
             rect.width -= 3;
 
-            o.levelAndOverride = SerializedScalableSettingValueUI.LevelFieldGUI(
+            var levelAndOverride = SerializedScalableSettingValueUI.LevelFieldGUI(
                 rect,
                 title,
                 ScalableSettingSchema.GetSchemaOrNull(ScalableSettingSchemaId.With3Levels),
                 level,
                 useOverride
             );
+            value.intValue = ScalableSettingLevelParameter.GetScalableSettingLevelParameterValue(levelAndOverride.level, levelAndOverride.useOverride);
             return true;
         }
     }

com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/GlobalPostProcessingQualitySettings.cs

@@ -33,6 +33,11 @@ public ScalableSettingLevelParameter(int level, bool useOverride, bool overrideS
 
         }
 
+        internal static int GetScalableSettingLevelParameterValue(int level, bool useOverride)
+        {
+            return useOverride ? LevelCount : (int)level;
+        }
+
         /// <summary>
         /// Level and Override.
         /// </summary>
@@ -42,7 +47,7 @@ public ScalableSettingLevelParameter(int level, bool useOverride, bool overrideS
             set
             {
                 var (level, useOverride) = value;
-                this.value = useOverride ? LevelCount : (int)level;
+                this.value = GetScalableSettingLevelParameterValue(level, useOverride);
             }
         }
     }