Fixed various issues with render graph viewer when entering playmode. #7040

Author: JulienIgnace-Unity

com.unity.render-pipelines.core/Editor/RenderGraph/RenderGraphViewer.cs

@@ -660,6 +660,11 @@ void OnExecutionUnregistered(RenderGraph graph, string name)
 
     void OnEnable()
     {
+        // For some reason, when entering playmode, CreateGUI is not called again so we need to rebuild the UI because all references are lost.
+        // Apparently it was not the case a while ago.
+        if (m_Root == null)
+            RebuildUI();
+
         for (int i = 0; i < (int)RenderGraphResourceType.Count; ++i)
             m_ResourceElementsInfo[i] = new DynamicArray<ResourceElementInfo>();
 

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

@@ -40,6 +40,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed performance penalty when hardware DRS was used between multiple views like editor or other gameviews (case 1354382)
 - Fixed PBR Dof using the wrong resolution for COC min/max filter, and also using the wrong parameters when running post TAAU stabilization. (case 1388961)
 - Fixed RTGI potentially reading from outside the half res pixels due to missing last pixel during the upscale pass (case 1400310).
+- Fixed various issues with render graph viewer when entering playmode.
 
 ## [12.1.4] - 2021-12-07