basic drop to set displaySet

platform/core/src/extensions/ExtensionManager.js

@@ -178,7 +178,7 @@ export default class ExtensionManager {
 
     try {
       const extensionModule = getModuleFn({
-        getDataSources: this.getDataSources,
+        getDataSources: this.getDataSources, // Why pass this in if we're passing in `extensionManager`?
         servicesManager: this._servicesManager,
         commandsManager: this._commandsManager,
         appConfig: this._appConfig,

platform/core/src/services/DisplaySetService/DisplaySetService.js

@@ -46,12 +46,13 @@ export default class DisplaySetService {
     );
   };
 
-  getDisplaySetByUID = displaySetInstanceUid => {
-    // TODO: Why is this searching active, not just displaySets?
-    return displaySetCache.find(
+  /**
+   * @param {string} displaySetInstanceUID
+   * @returns {object} displaySet
+   */
+  getDisplaySetByUID = displaySetInstanceUid => displaySetCache.find(
       displaySet => displaySet.displaySetInstanceUID === displaySetInstanceUid
     );
-  };
 
   /**
    * Broadcasts displaySetService changes.