Fix Custom Post Process affecting preview cameras #1988

Author: Antoine Lelievre

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

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed an issue that caused a null reference when deleting camera component in a prefab. (case 1244430)
 - Fixed nan in pbr sky
 - Fixed Light skin not properly applied on the LookDev when switching from Dark Skin (case 1278802)
+- Fixed Custom Post Processes affecting preview cameras.
 
 ## [7.5.1] - 2020-09-02
 

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

@@ -695,6 +695,8 @@ internal static void Sanitize(ref FrameSettings sanitizedFrameSettings, Camera c
             sanitizedFrameSettings.bitDatas[(int)FrameSettingsField.CustomPass] &= renderPipelineSettings.supportCustomPass;
             sanitizedFrameSettings.bitDatas[(int)FrameSettingsField.CustomPass] &= camera.cameraType != CameraType.Preview;
 
+            sanitizedFrameSettings.bitDatas[(int)FrameSettingsField.CustomPostProcess] &= camera.cameraType != CameraType.Preview;
+
             // Deferred opaque are always using Fptl. Forward opaque can use Fptl or Cluster, transparent use cluster.
             // When MSAA is enabled we disable Fptl as it become expensive compare to cluster
             // In HD, MSAA is only supported for forward only rendering, no MSAA in deferred mode (for code complexity reasons)