Method _removeStickyStyle

src/cdk/table/sticky-styler.ts:351–378

* Removes the sticky style on the element by removing the sticky cell CSS class, re-evaluating * the zIndex, removing each of the provided sticky directions, and removing the * sticky position if there are no more directions.

(element: HTMLElement, stickyDirections: StickyDirection[])

   * sticky position if there are no more directions.
   */
  _removeStickyStyle(element: HTMLElement, stickyDirections: StickyDirection[]) {
    if (!element.classList.contains(this._stickCellCss)) {
      return;
    }

    for (const dir of stickyDirections) {
      element.style[dir] = '';
      element.classList.remove(this._borderCellCss[dir]);
    }

    // If the element no longer has any more sticky directions, remove sticky positioning and
    // the sticky CSS class.
    // Short-circuit checking element.style[dir] for stickyDirections as they
    // were already removed above.
    const hasDirection = STICKY_DIRECTIONS.some(
      dir => stickyDirections.indexOf(dir) === -1 && element.style[dir],
    );
    if (hasDirection) {
      element.style.zIndex = this._getCalculatedZIndex(element);
    } else {
      // When not hasDirection, _getCalculatedZIndex will always return ''.
      element.style.zIndex = '';
      if (this._needsPositionStickyOnElement) {
        element.style.position = '';
      }
      element.classList.remove(this._stickCellCss);
    }
  }

  /**
   * Adds the sticky styling to the element by adding the sticky style class, changing position