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Fetch number of records in a FormDataSource (e.g. of a Grid)

SysQuery::getTotal works fine, but the trick is how to handle temporary data sources where getTotal does not work:

if(!formDataSource.curser().isTmp())
{
recordCount = SysQuery::getTotal(formDataSource.queryRun());
}
else
{
while(!formDataSource.allRowsLoaded())
{
formDataSource.getNext();
}
recordCount = formDataSource.numberOfRowsLoaded();
}

Now recordCount contains the number of Records in the FormDataSource irrespective of the Tmp status of the data source. Of course the whole tmp-data source has been loaded in the process, which might be an issue in some cases.
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