Updating a view's proxy model when the source model changes

[Santosh Reddy]

Add this

int EsxModel::ContentModel::rowCount(const QModelIndex &parent) const
{
    if(parent.isValid())
        return 0;
 
    return mFiles.size();
}

int EsxModel::ContentModel::rowCount(const QModelIndex &parent) const
{
    if(parent.isValid())
        return 0;

    return mFiles.size();
}

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also do the corresponding changes in parent() and index()