feat: sort interceptors by priority, ensure myItemsInterceptor runs first (#5965)

* feat: sort interceptors by priority

* fix(#5914): high priority for MyItemsInterceptor

* fix: create myItems if object is falsy

* test(e2e): update snapshots

Co-authored-by: Scott Bell <scott@traclabs.com>

src/api/objects/InterceptorRegistry.js

@@ -19,6 +19,7 @@
  * this source code distribution or the Licensing information page available
  * at runtime from the About dialog for additional information.
  *****************************************************************************/
+const DEFAULT_INTERCEPTOR_PRIORITY = 0;
 export default class InterceptorRegistry {
     /**
      * A InterceptorRegistry maintains the definitions for different interceptors that may be invoked on domain objects.
@@ -45,7 +46,6 @@ export default class InterceptorRegistry {
      * @memberof module:openmct.InterceptorRegistry#
      */
     addInterceptor(interceptorDef) {
-        //TODO: sort by priority
         this.interceptors.push(interceptorDef);
     }
 
@@ -56,10 +56,18 @@ export default class InterceptorRegistry {
      * @memberof module:openmct.InterceptorRegistry#
      */
     getInterceptors(identifier, object) {
+
+        function byPriority(interceptorA, interceptorB) {
+            let priorityA = interceptorA.priority ?? DEFAULT_INTERCEPTOR_PRIORITY;
+            let priorityB = interceptorB.priority ?? DEFAULT_INTERCEPTOR_PRIORITY;
+
+            return priorityB - priorityA;
+        }
+
         return this.interceptors.filter(interceptor => {
             return typeof interceptor.appliesTo === 'function'
                 && interceptor.appliesTo(identifier, object);
-        });
+        }).sort(byPriority);
     }
 
 }

src/plugins/myItems/myItemsInterceptor.js

@@ -37,14 +37,15 @@ function myItemsInterceptor(openmct, identifierObject, name) {
             return identifier.key === MY_ITEMS_KEY;
         },
         invoke: (identifier, object) => {
-            if (openmct.objects.isMissing(object)) {
+            if (!object || openmct.objects.isMissing(object)) {
                 openmct.objects.save(myItemsModel);
 
                 return myItemsModel;
             }
 
             return object;
-        }
+        },
+        priority: openmct.priority.HIGH
     };
 }