Minor tweaks to dropEndHandler, gonna reuse the end code for double click handler

src/app/editor/editor.component.ts

@@ -122,18 +122,23 @@ export class EditorComponent implements OnInit {
   }
 
   dropEndHandler(event: CdkDragDrop<WorldArea[]> | CdkDragDrop<PlanElement[]>) {
-    let bounds = this.planElemFilterBounds();
-    let end = this.plan.plan.length;
-    if (bounds) {
-      end = bounds[1];
-    }
+
 
     if (isWorldAreaEvent(event) && this.areas) {
-      this.plan.plan.splice(end, 0, this.planItemFromArea(event.previousContainer.data[event.previousIndex]));
-      this.scrollToEnd();
+      this.plan.plan.splice(this.getEnd(), 0, this.planItemFromArea(event.previousContainer.data[event.previousIndex]));
+    } else {
+      moveItemInArray(this.plan.plan, event.previousIndex, this.getEnd());
+    }
+
+    this.scrollToEnd();
+  }
+
+  getEnd() {
+    let bounds = this.planElemFilterBounds();
+    if (bounds) {
+      return bounds[1];
     } else {
-      moveItemInArray(this.plan.plan, event.previousIndex, end);
-      this.scrollToEnd();
+      return this.plan.plan.length;
     }
   }