message: Fixed the - added the `getCellQuestion` method
diff: @@ -1953,11 +1953,20 @@ export class QuestionMatrixDropdownModelBase
  ): SurveyError {
  if (!this.survey) return;
  var self = this;
  + var getQuestion = function(colName: any) {
  + for (var i = 0; self.columns.length; i++) {
  + if (self.columns[i].name === colName) {
  + return row.cells[i].question;
  + }
  + }
  + return null;
  + };
  var options = {
  row: row,
  columnName: columnName,
  rowValue: rowValue,
  - value: rowValue[columnName]
  + value: rowValue[columnName],
  + getCellQuestion: getQuestion
  };
  return this.survey.matrixCellValidate(this, options);
  }
  