Force depth prepass for forward-only rendering

Assets/ScriptableRenderPipeline/HDRenderPipeline/Editor/HDRenderPipelineInspector.cs

             EditorGUILayout.Space();
             EditorGUILayout.LabelField(styles.renderingSettingsLabel);
             EditorGUI.indentLevel++;
+            EditorGUI.BeginChangeCheck();
+
+
+            if (EditorGUI.EndChangeCheck())
+            {
+                if (m_RenderingUseForwardOnly.boolValue && !m_RenderingUseDepthPrepass.boolValue)
+                {
+                    // Force depth prepass for forward-only rendering (for FPTL, etc).
+                    m_RenderingUseDepthPrepass.boolValue = true;
+                    HackSetDirty(renderContext); // Repaint
+                }
+            }
             EditorGUI.indentLevel--;
         }