Make the benchmarks more comparable: - Store the QDir::Filters in one central var, this way it's the same in all the call sites - Add a `bool forceStat`, when true force calling stat(), either explicitly in posix_helper(), or implicitly in Qt classes by e.g. calling a QFileInfo method that would have to call system stat() internally. Otherwise benchmarking readdir()/dirent showed bigger times, which was mostly due to the explicit stat() calls, whereas we can use dirent::d_type (on the platforms where it's available) Drive by change: for std::filesystem::recursive_directory_iterator, set skip_permission_denied option and use the non-throwing constructor. Change-Id: Icf138a5dc41d32741c1be611d664b01008b2f3fe Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>