Do not apply collection if used

Author: sudeeptarlekar

application/client/src/app/service/history/session.ts

@@ -197,11 +197,15 @@ export class HistorySession extends Subscriber {
     }
 
     public apply(collection: Collections) {
-        if (this.storage.collections.get(collection.uuid) === undefined) {
+        let storage_collection = this.storage.collections.get(collection.uuid);
+
+        if (storage_collection === undefined) {
             this.storage.collections.insert(collection);
-        } else {
-            this.storage.collections.used(collection.uuid);
+        } 
+        if (storage_collection !== undefined && storage_collection.used > 0) {
+            return;
         }
+        this.storage.collections.used(collection.uuid);
         this.setCollection(collection);
         this.definitions.list().forEach((def) => {
             this.collections.bind(def);