Bug 164989 [Viewers] ColumnViewer#getColumnViewerOwner() doesn't respects column count
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
}
	/**
	 * Update the cached cell with the row and column.
	 * 
	 * @param rowItem
	 * @param column
	 * @return ViewerCell
	 */
	ViewerCell updateCell(ViewerRow rowItem, int column) {
		cell.update(rowItem, column);
		return cell;
	}
	/**
	 * Find the {@link Item} relative to the widget coordinate system.
	 * 
	 * @param point
	 *            the x/y coordinates relative to the widget
	 * @return the {@link Item} at the coordinates or <code>null</code> if no item is
	 *         located there
	 */
	protected abstract Item getItemAt(Point point);
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.StructuredViewer#getItem(int, int)
	 */
	protected Item getItem(int x, int y) {
		return getItemAt(getControl().toControl(x, y));
	}
}