private long headerViewPositionToId(int pos) {
        if (pos == MATCHED_STICKIED_HEADER) {
            return mCurrentHeaderId;
        }
        return mAdapter.getHeaderId(getFirstVisiblePosition() + pos);
    }
If set to true, headers will ignore horizontal padding.

@param b if true, horizontal padding is ignored by headers
Library/src/com/tonicartos/widget/stickygridheaders/StickyGridHeadersGridView.java