private void dragColumnDivider(int x) {
		int old = mDividerDrag.getWidth();
		if (x <= mColumnStart + DIVIDER_HIT_SLOP * 2) {
			x = mColumnStart + DIVIDER_HIT_SLOP * 2 + 1;
		}
		x -= mColumnStart;
		if (old != x) {
			adjustColumnWidth(mDividerDrag, x);
		}
	}