Persists target application frequency when changing targets

com.unity.perception/Editor/Randomization/ParameterElement.cs

         VisualElement m_TargetContainer;
         ToolbarMenu m_TargetPropertyMenu;
         SerializedProperty m_SerializedProperty;
-        SerializedProperty m_TargetGameObjectProperty;
+        SerializedProperty m_Target;
+        SerializedProperty m_TargetGameObject;
+        SerializedProperty m_ApplicationFrequency;
 
         const string k_CollapsedParameterClass = "collapsed-parameter";
 
 
             m_TargetContainer = this.Q<VisualElement>("target-container");
             m_TargetPropertyMenu = this.Q<ToolbarMenu>("property-select-menu");
-            m_TargetGameObjectProperty = m_SerializedProperty.FindPropertyRelative("target.gameObject");
+            m_Target = m_SerializedProperty.FindPropertyRelative("target");
+            m_TargetGameObject = m_Target.FindPropertyRelative("gameObject");
-            frequencyField.BindProperty(m_SerializedProperty.FindPropertyRelative("target.applicationFrequency"));
+            m_ApplicationFrequency = m_Target.FindPropertyRelative("applicationFrequency");
+            frequencyField.BindProperty(m_ApplicationFrequency);
-            targetField.value = m_TargetGameObjectProperty.objectReferenceValue;
+            targetField.value = m_TargetGameObject.objectReferenceValue;
-                m_TargetGameObjectProperty.objectReferenceValue = (GameObject)evt.newValue;
+                var appFreqEnumIndex = m_ApplicationFrequency.enumValueIndex;
+                m_TargetGameObject.objectReferenceValue = (GameObject)evt.newValue;
+                m_ApplicationFrequency.enumValueIndex = appFreqEnumIndex;
                 m_SerializedProperty.serializedObject.ApplyModifiedProperties();
                 ToggleTargetContainer();
                 FillPropertySelectMenu();
 
         void ToggleTargetContainer()
         {
-            m_TargetContainer.style.display = m_TargetGameObjectProperty.objectReferenceValue == null
+            m_TargetContainer.style.display = m_TargetGameObject.objectReferenceValue == null
                 ? new StyleEnum<DisplayStyle>(DisplayStyle.None)
                 : new StyleEnum<DisplayStyle>(DisplayStyle.Flex);
         }
-            m_SerializedProperty.FindPropertyRelative("target.component").objectReferenceValue = null;
-            m_SerializedProperty.FindPropertyRelative("target.propertyName").stringValue = string.Empty;
-            m_SerializedProperty.FindPropertyRelative("target.applicationFrequency").enumValueIndex = 0;
+            m_Target.FindPropertyRelative("component").objectReferenceValue = null;
+            m_Target.FindPropertyRelative("propertyName").stringValue = string.Empty;
-            m_SerializedProperty.FindPropertyRelative("target.gameObject").objectReferenceValue = newTarget.gameObject;
-            m_SerializedProperty.FindPropertyRelative("target.component").objectReferenceValue = newTarget.component;
-            m_SerializedProperty.FindPropertyRelative("target.propertyName").stringValue = newTarget.propertyName;
-            m_SerializedProperty.FindPropertyRelative("target.fieldOrProperty").enumValueIndex = (int)newTarget.fieldOrProperty;
+            m_TargetGameObject.objectReferenceValue = newTarget.gameObject;
+            m_Target.FindPropertyRelative("component").objectReferenceValue = newTarget.component;
+            m_Target.FindPropertyRelative("propertyName").stringValue = newTarget.propertyName;
+            m_Target.FindPropertyRelative("fieldOrProperty").enumValueIndex = (int)newTarget.fieldOrProperty;
             m_SerializedProperty.serializedObject.ApplyModifiedProperties();
             m_TargetPropertyMenu.text = TargetPropertyDisplayText(parameter.target);
         }