Add EditorModel::openDocumentCount and use it.
As is, EditorModel::rowCount() could also be used, but this will most probably change later. So we simply add a method that is independent from all the "model" methods. Change-Id: I39a2338d765ed6a269bf8977b816a5eda371afdf Reviewed-by:Marco Bubke <marco.bubke@digia.com> Reviewed-by:
Eike Ziller <eike.ziller@digia.com>
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