Fixed case where material keywords would not get setup before usage (#2961)

Author: adrien-de-tocqueville

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

@@ -43,6 +43,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed the planar depth texture not being properly created and rendered to (case 1299617).
 - Fixed C# 8 compilation issue with turning on nullable checks (case 1300167)
 - Fixed affects AO for deacl materials.
+- Fixed case where material keywords would not get setup before usage.
 
 ### Changed
 - Removed the material pass probe volumes evaluation mode.

com.unity.render-pipelines.high-definition/Editor/AssetProcessors/MaterialPostProcessor.cs

@@ -157,6 +157,9 @@ static void OnPostprocessAllAssets(string[] importedAssets, string[] deletedAsse
                         //due to FB 1175514, this not work. It is being fixed though.
                         //delayed call of the following work in some case and cause infinite loop in other cases.
                         AssetDatabase.AddObjectToAsset(assetVersion, asset);
+
+                        // Init material in case it's used before an inspector window is opened
+                        HDShaderUtils.ResetMaterialKeywords(material);
                     }
                     else
                     {