ngForWithReuse

  private _applyChanges(changes: IterableChanges<T>) {

    let singleAddIndex: number|undefined = undefined;
    let singleRemoveIndex: number|undefined = undefined;
    let hasMultipleMutations: boolean = false;
    let singleMutatedItem: T|undefined = undefined;
    changes.forEachOperation((item: IterableChangeRecord<any>, adjustedPreviousIndex: number | null, currentIndex: number | null) => {
      if (! hasMultipleMutations) {
        if (adjustedPreviousIndex === null && currentIndex !== null) {
          if (! singleAddIndex) {
            singleAddIndex = currentIndex;
            singleMutatedItem = item.item;
          } else {
            hasMultipleMutations = true;
          }
        }
        if (adjustedPreviousIndex !== null && currentIndex === null) {
          if (! singleRemoveIndex) {
            singleRemoveIndex = adjustedPreviousIndex;
          } else {
            hasMultipleMutations = true;
          }
        }
      }
    });
    if (! hasMultipleMutations && singleAddIndex !== undefined && singleRemoveIndex !== undefined && singleAddIndex === singleRemoveIndex) {
      const viewRef = <EmbeddedViewRef<PpNgForOfContext<T>>>this._viewContainer.get(singleAddIndex);
      viewRef.context.$implicit = singleMutatedItem;
      return;
    }