Method _sortValues

src/material/select/select.ts:1265–1276

Sorts the selected values in the selected based on their order in the panel.

()

  /** Sorts the selected values in the selected based on their order in the panel. */
  private _sortValues() {
    if (this.multiple) {
      const options = this.options.toArray();

      this._selectionModel.sort((a, b) => {
        return this.sortComparator
          ? this.sortComparator(a, b, options)
          : options.indexOf(a) - options.indexOf(b);
      });
      this.stateChanges.next();
    }
  }

  /** Emits change event to set the model value. */
  private _propagateChanges(fallbackValue?: any): void {