docs: private void logChildren() {
          Log.d(TAG, "internal representation of views on the screen");
          for (int i = 0; i < getChildCount(); i++) {
              View child = getChildAt(i);
              Log.d(TAG, "item " + getPosition(child) + ", coord:"
                      + mOrientationHelper.getDecoratedStart(child));
          }
          Log.d(TAG, "==============");
      }