Core: Fix displaying issue of read only file dialog.
If there is just one column the user has no choice. In this case we want to hide all columns. The issue was introduced by 111f65b5 . Task-number: QTCREATORBUG-13171 Change-Id: Ie151b908866f80d138fd262f6c3708ef380ca908 Reviewed-by: Eike Ziller <email@example.com>
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