Method _redirectDestroyedChipFocus

src/material/chips/chip-set.ts:313–337

* Finds the next appropriate chip to move focus to, * if the currently-focused chip is destroyed.

()

   * if the currently-focused chip is destroyed.
   */
  protected _redirectDestroyedChipFocus() {
    if (this._lastDestroyedFocusedChipIndex == null) {
      return;
    }

    if (this._chips.length) {
      const newIndex = Math.min(this._lastDestroyedFocusedChipIndex, this._chips.length - 1);
      const chipToFocus = this._chips.toArray()[newIndex];

      if (chipToFocus.disabled) {
        // If we're down to one disabled chip, move focus back to the set.
        if (this._chips.length === 1) {
          this.focus();
        } else {
          this._keyManager.setPreviousItemActive();
        }
      } else {
        chipToFocus.focus();
      }
    } else {
      this.focus();
    }

    this._lastDestroyedFocusedChipIndex = null;
  }
}