Fix scene view grid rendering in LW (copy depth out)

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipeline.cs

                 bool shadows = ShadowPass(visibleLights, ref context, ref lightData);
 
                 FrameRenderingConfiguration frameRenderingConfiguration;
-                SetupFrameRenderingConfiguration(out frameRenderingConfiguration, shadows, stereoEnabled);
+                SetupFrameRenderingConfiguration(out frameRenderingConfiguration, shadows, stereoEnabled, sceneViewCamera);
                 SetupIntermediateResources(frameRenderingConfiguration, ref context);
 
                 // SetupCameraProperties does the following:
 
                 ForwardPass(visibleLights, frameRenderingConfiguration, ref context, ref lightData, stereoEnabled);
 
+
+#if UNITY_EDITOR
+                if (sceneViewCamera)
+                    CopyTexture(cmd, CameraRenderTargetID.depth, BuiltinRenderTextureType.CameraTarget, m_CopyDepthMaterial, true);
+#endif
                 cmd.ReleaseTemporaryRT(m_ShadowMapRTID);
                 cmd.ReleaseTemporaryRT(m_ScreenSpaceShadowMapRTID);
                 cmd.ReleaseTemporaryRT(CameraRenderTargetID.depthCopy);
             }
         }
 
-        private void SetupFrameRenderingConfiguration(out FrameRenderingConfiguration configuration, bool shadows, bool stereoEnabled)
+        private void SetupFrameRenderingConfiguration(out FrameRenderingConfiguration configuration, bool shadows, bool stereoEnabled, bool sceneViewCamera)
         {
             configuration = (stereoEnabled) ? FrameRenderingConfiguration.Stereo : FrameRenderingConfiguration.None;
             if (stereoEnabled && XRSettings.eyeTextureDesc.dimension == TextureDimension.Tex2DArray)
                         m_RequireCopyColor = true;
                 }
             }
+
+            if (sceneViewCamera)
+                m_RequireDepthTexture = true;
 
             if (shadows)
             {
             }
         }
 
-        private void CopyTexture(CommandBuffer cmd, RenderTargetIdentifier sourceRT, RenderTargetIdentifier destRT, Material copyMaterial)
+        private void CopyTexture(CommandBuffer cmd, RenderTargetIdentifier sourceRT, RenderTargetIdentifier destRT, Material copyMaterial, bool forceBlit = false)
-            if (m_CopyTextureSupport != CopyTextureSupport.None)
+            if (m_CopyTextureSupport != CopyTextureSupport.None && !forceBlit)
                 cmd.CopyTexture(sourceRT, destRT);
             else
                 cmd.Blit(sourceRT, destRT, copyMaterial);

ScriptableRenderPipeline/LightweightPipeline/LWRP/LightweightPipelineUtils.cs

         DepthPrePass = (1 << 4),
         DepthCopy = (1 << 5),
         DefaultViewport = (1 << 6),
-        IntermediateTexture = (1 << 7),
+        IntermediateTexture = (1 << 7)
     }
 
     public static class LightweightUtils

ScriptableRenderPipeline/LightweightPipeline/LWRP/Shaders/LightweightCopyDepth.shader

 
         Pass
         {
-            ZTest Always ZWrite Off ColorMask 0
+            ZTest Always ZWrite On ColorMask 0
 
             HLSLPROGRAM
             // Required to compile gles 2.0 with standard srp library