ShowOnlyDesktopPackages
if (specification->ShowOnlyDesktopPackages())
fShowOnlyDesktopPackages = value->ShowOnlyDesktopPackages();
if (!fSource.IsSet() || fSource->ShowOnlyDesktopPackages() != value) {
&& fShowOnlyDesktopPackages == other.ShowOnlyDesktopPackages()
bool ShowOnlyDesktopPackages() const;
fShowOnlyDesktopItem->SetMarked(packageFilterSpecification->ShowOnlyDesktopPackages());
fShowDesktopAndNonDesktopItem->SetMarked(!packageFilterSpecification->ShowOnlyDesktopPackages()
&& fModel.FilterSpecification()->ShowOnlyDesktopPackages()) {
fModel.FilterSpecification()->ShowOnlyDesktopPackages());