_addIconHandler(event) {
    const button = event.target.closest('.tui-image-editor-button');

    if (button) {
      const iconType = button.getAttribute('data-icontype');
      const iconColor = this._els.iconColorpicker.color;
      this.actions.discardSelection();
      this.actions.changeSelectableAll(false);
      this._els.addIconButton.classList.remove(this.iconType);
      this._els.addIconButton.classList.add(iconType);

      if (this.iconType === iconType) {
        this.changeStandbyMode();
      } else {
        this.actions.addIcon(iconType, iconColor);
        this.iconType = iconType;
      }
    }
  }
Change icon color
@param {object} event - add button event object
@private