[Backport 8.x.x] Fixed Look Dev with Light Theme

com.unity.render-pipelines.core/Editor/LookDev/DisplayWindow.cs

@@ -42,7 +42,7 @@ public interface IViewDisplayer
         /// <summary>Callback on update requested</summary>
         event Action OnUpdateRequested;
     }
-    
+
     partial class DisplayWindow : EditorWindow, IViewDisplayer
     {
         static partial class Style
@@ -82,7 +82,7 @@ internal static readonly (Texture2D icon, string tooltip) k_LayoutStackIcon =
             internal const string k_CameraMenuSync1On2 = "Align Camera 1 with Camera 2";
             internal const string k_CameraMenuSync2On1 = "Align Camera 2 with Camera 1";
             internal const string k_CameraMenuReset = "Reset Cameras";
-            
+
             internal const string k_EnvironmentSidePanelName = "Environment";
             internal const string k_DebugSidePanelName = "Debug";
 
@@ -127,7 +127,7 @@ internal static readonly (Texture2D icon, string tooltip) k_LayoutStackIcon =
         Label m_NoEnvironment2;
 
         Image[] m_Views = new Image[2];
-        
+
         LayoutContext layout
             => LookDev.currentContext.layout;
 
@@ -143,7 +143,7 @@ Layout viewLayout
                 }
             }
         }
-        
+
         SidePanel sidePanel
         {
             get => layout.showedSidePanel;
@@ -218,7 +218,7 @@ event Action IViewDisplayer.OnUpdateRequested
 
         void OnEnable()
         {
-            //Stylesheet             
+            //Stylesheet
             // Try to load stylesheet. Timing can be odd while upgrading packages (case 1219692).
             // In this case, it will be fixed in OnGUI. Though it can spawn error while reimporting assets.
             // Waiting for filter on stylesheet (case 1228706) to remove last error.
@@ -486,7 +486,7 @@ Rect IViewDisplayer.GetRect(ViewCompositionIndex index)
                     throw new ArgumentException("Unknown ViewCompositionIndex: " + index);
             }
         }
-        
+
         Vector2 m_LastFirstViewSize = new Vector2();
         Vector2 m_LastSecondViewSize = new Vector2();
         void IViewDisplayer.SetTexture(ViewCompositionIndex index, Texture texture)
@@ -532,7 +532,7 @@ void IViewDisplayer.SetTexture(ViewCompositionIndex index, Texture texture)
                     throw new ArgumentException("Unknown ViewCompositionIndex: " + index);
             }
         }
-        
+
         void IViewDisplayer.Repaint() => Repaint();
 
         void ApplyLayout(Layout value)
@@ -627,19 +627,21 @@ IStyle GetEnvironmentContenairDraggerStyle()
 
         void OnGUI()
         {
-            //Stylesheet             
+            //Stylesheet
             // [case 1219692] if LookDev is open while reimporting CoreRP package,
             // stylesheet can be null. In this case, we can have a null stylesheet
-            // registered as it got destroyed. Reloading it. As we cannot just 
+            // registered as it got destroyed. Reloading it. As we cannot just
             // remove a null entry, we must filter and reconstruct the while list.
             if (styleSheet == null || styleSheet.Equals(null)
                 || (!EditorGUIUtility.isProSkin && (styleSheetLight == null || styleSheetLight.Equals(null))))
             {
                 // While (case 1228706) is still on going, we sill close and reopen the look dev.
                 // This will prevent spawning error at frame.
-                LookDev.Close();
-                LookDev.Open();
-                return;
+                // Note 2: This actually causes the lookdev to break completely with light theme.
+                // Until the actual issue is fixed, we'll comment this fix out as it only concerns an upgrade problem.
+                //LookDev.Close();
+                //LookDev.Open();
+                //return;
 
                 // Following lines is the correct fix if UIElement filter garbage collected Stylesheet.
 

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

@@ -72,6 +72,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - 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.
+- Fixed an issue where opening the look dev window with the light theme would make the window blink and eventually crash unity.
 
 ### Changed
 - Shadowmask and realtime reflection probe property are hide in Quality settings