in simpleProviderManaged/ActiveEnumeration.cs [124:139]
private void SaveFilter(
string filter)
{
if (string.IsNullOrEmpty(filter))
{
this.filterString = string.Empty;
}
else
{
this.filterString = filter;
if (this.IsCurrentValid && this.IsCurrentHidden())
{
this.MoveNext();
}
}
}