[settings] add PR4490 & PR4492 toggles

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

Properly handle the `AppletId::None` case by returning a null frontend applet instead of falling back to the stub implementation.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4500
Reviewed-by: lizzie <lizzie@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

src/core/hle/service/am/frontend/applets.cpp

@@ -250,9 +250,10 @@ std::shared_ptr<FrontendApplet> FrontendAppletHolder::GetApplet(std::shared_ptr<
         return std::make_shared<PhotoViewer>(system, applet, mode, *frontend.photo_viewer);
     case AppletId::NetConnect:
         return std::make_shared<NetConnect>(system, applet, mode, *frontend.net_connect);
+    case AppletId::None:
+        return nullptr;
     default:
-        LOG_ERROR(Service_AM, "No backend implementation exists for applet_id={:02X} program_id={:016X}"
-                              "Falling back to stub applet", static_cast<u8>(id), applet->program_id);
+        UNIMPLEMENTED_MSG("No frontend implementation exists for applet_id={:02X} program_id={:016X}! Using stub applet.", static_cast<u8>(id), applet->program_id);
         return std::make_shared<StubApplet>(system, applet, id, mode);
     }
 }

src/yuzu/game/common.h

@@ -12,25 +12,29 @@ namespace Yuzu {
 
 inline bool ContainsAllWords(const QString& haystack, const QString& userinput) {
     const QStringList userinput_split = userinput.split(QLatin1Char{' '}, Qt::SkipEmptyParts);
-    return std::all_of(userinput_split.begin(), userinput_split.end(),
-                       [&haystack](const QString& s) { return haystack.contains(s); });
+    return std::all_of(userinput_split.begin(), userinput_split.end(), [&haystack](const QString& s) {
+        return haystack.contains(s);
+    });
 }
 
 inline bool FilterMatches(const QString& filter, const QStandardItem* item) {
     if (filter.isEmpty())
         return true;
 
+    auto const sluggify = [](const QString& s) {
+        QString o(s.normalized(QString::NormalizationForm_D).toLower());
+        return o.replace(QRegularExpression(QStringLiteral("[^a-z\\s]")), QStringLiteral(""));
+    };
+
+    const auto norm_filter = sluggify(filter);
     const auto program_id = item->data(GameListItemPath::ProgramIdRole).toULongLong();
-
-    const QString file_path = item->data(GameListItemPath::FullPathRole).toString().toLower();
-    const QString file_title = item->data(GameListItemPath::TitleRole).toString().toLower();
+    const QString file_path = sluggify(item->data(GameListItemPath::FullPathRole).toString());
+    const QString file_title = sluggify(item->data(GameListItemPath::TitleRole).toString());
     const QString file_program_id = QStringLiteral("%1").arg(program_id, 16, 16, QLatin1Char{'0'});
-
-    const QString file_name =
-        file_path.mid(file_path.lastIndexOf(QLatin1Char{'/'}) + 1) + QLatin1Char{' '} + file_title;
-
-    return Yuzu::ContainsAllWords(file_name, filter) ||
-           (file_program_id.size() == 16 && file_program_id.contains(filter));
+    const QString file_name = sluggify(file_path.mid(file_path.lastIndexOf(QLatin1Char{'/'}) + 1) + QLatin1Char{' '} + file_title);
+    return (ContainsAllWords(file_name, norm_filter)
+        || ContainsAllWords(file_title, norm_filter))
+        || (file_program_id.size() == 16 && file_program_id.contains(norm_filter));
 }
 
 } // namespace Yuzu