Avoid scan on the halEvents to return only the buffered events

Scanning on the buffer aggregates all the previous results

frontend/src/app/modules/hal/services/hal-events.service.ts

@@ -1,6 +1,6 @@
 import {Injectable} from "@angular/core";
 import {Observable, Subject} from "rxjs";
-import {buffer, debounceTime, filter, scan} from "rxjs/operators";
+import {buffer, debounceTime, filter} from "rxjs/operators";
 import {HalResource} from "core-app/modules/hal/resources/hal-resource";
 import {ResourceChangesetCommit} from "core-app/modules/fields/edit/services/hal-resource-editing.service";
 
@@ -45,8 +45,7 @@ export class HalEventsService {
       .events$
       .pipe(
         filter((event:HalEvent) => event.resourceType === resourceType),
-        buffer(this.events$.pipe(debounceTime(debounceTimeInMs))),
-        scan((acc, curr) => acc.concat(curr))
+        buffer(this.events$.pipe(debounceTime(debounceTimeInMs)))
       );
   }