Game list: improve deduplication logic

rpcs3/rpcs3qt/game_list_frame.cpp

@@ -423,8 +423,10 @@ void game_list_frame::Refresh(const bool fromDrive, const bool scrollAfter)
 			path_list.back().resize(path_list.back().find_last_not_of('/') + 1);
 		}
 
-		// std::set is used to remove duplicates from the list
-		for (const auto& dir : std::set<std::string>(std::make_move_iterator(path_list.begin()), std::make_move_iterator(path_list.end()))) { try
+		// Used to remove duplications from the list (serial -> set of cats)
+		std::map<std::string, std::set<std::string>> serial_cat;
+
+		for (const auto& dir : path_list) { try
 		{
 			const std::string sfb = dir + "/PS3_DISC.SFB";
 			const std::string sfo = dir + (fs::is_file(sfb) ? "/PS3_GAME/PARAM.SFO" : "/PARAM.SFO");
@@ -448,6 +450,12 @@ void game_list_frame::Refresh(const bool fromDrive, const bool scrollAfter)
 			game.resolution   = psf::get_integer(psf, "RESOLUTION");
 			game.sound_format = psf::get_integer(psf, "SOUND_FORMAT");
 
+			// Detect duplication
+			if (!serial_cat[game.serial].emplace(game.category).second)
+			{
+				continue;
+			}
+
 			bool bootable = false;
 			auto cat = category::cat_boot.find(game.category);
 			if (cat != category::cat_boot.end())