Request for easier support for SearchBar functionality with sub-classed sections

[timahrentlov]

For when you have sub-classed sections this would be nice to have:

public void PerformFilter (string text)
{
..
newSection = MakeNewSection(section);
...
}

public virtual Section MakeNewSection(Section section)
{
return new Section(section.Header, section.Footer)
{
FooterView = section.FooterView,
HeaderView = section.HeaderView
};
}