message: fixed "dragDropHelper" name collision with the creator v1
diff: @@ -75,9 +75,10 @@ export class QuestionMatrixDynamicModel extends QuestionMatrixDropdownModelBase
  });
  }
  + public dragDropMatrixRows: DragDropMatrixRows;
  public setSurveyImpl(value: ISurveyImpl) {
  super.setSurveyImpl(value);
  - this.dragDropHelper = new DragDropMatrixRows(this.survey);
  + this.dragDropMatrixRows = new DragDropMatrixRows(this.survey);
  this.subscribeToDragDropHelper();
  }
  @@ -90,7 +91,7 @@ export class QuestionMatrixDynamicModel extends QuestionMatrixDropdownModelBase
  if (options.name === "isBottom") {
  this.renderedTable.rows.forEach(
  (renderedRow: QuestionMatrixDropdownRenderedRow) => {
  - renderedRow.ghostPosition = this.dragDropHelper.getGhostPosition(
  + renderedRow.ghostPosition = this.dragDropMatrixRows.getGhostPosition(
  renderedRow.row
  );
  }
  @@ -98,10 +99,10 @@ export class QuestionMatrixDynamicModel extends QuestionMatrixDropdownModelBase
  }
  };
  private subscribeToDragDropHelper = () => {
  - this.dragDropHelper.onPropertyChanged.add(this.handleDragDropHelperChanges);
  + this.dragDropMatrixRows.onPropertyChanged.add(this.handleDragDropHelperChanges);
  };
  private unsubscribeToDragDropHelper = () => {
  - this.dragDropHelper.onPropertyChanged.remove(
  + this.dragDropMatrixRows.onPropertyChanged.remove(
  this.handleDragDropHelperChanges
  );
  };
  @@ -109,7 +110,7 @@ export class QuestionMatrixDynamicModel extends QuestionMatrixDropdownModelBase
  event: PointerEvent,
  row: MatrixDropdownRowModelBase
  ) {
  - this.dragDropHelper.startDrag(event, row, this);
  + this.dragDropMatrixRows.startDrag(event, row, this);
  }
  public getType(): string {
  