/// <summary>
/// Transfers the contents from this cell to another.
/// </summary>
/// <param name="to">The transfer destination.</param>
/// <remarks>
/// <para>
/// If this cell is empty, an InvalidOperationException will be thrown.
/// </para>
/// <para>
/// If the destination cell is not empty, an InvalidOperationException
/// will be thrown.
/// </para>
/// </remarks>
public void MoveContent(BoardCell to)
{
ErrorIfEmpty();
var content = GetContent();
SetContent(null);
to.SetContent(content);
}
