fix(YouTube - Settings): Resolve settings search crash when searching for specific words

extensions/shared/library/src/main/java/app/revanced/extension/shared/Utils.java

@@ -45,6 +45,8 @@
 import androidx.annotation.Nullable;
 
 import java.text.Bidi;
+import java.text.Collator;
+import java.text.Normalizer;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
@@ -79,6 +81,15 @@ public class Utils {
     @Nullable
     private static Boolean isDarkModeEnabled;
 
+    // Cached Collator instance with its locale.
+    @Nullable
+    private static Locale cachedCollatorLocale;
+    @Nullable
+    private static Collator cachedCollator;
+
+    private static final Pattern PUNCTUATION_PATTERN = Pattern.compile("\\p{P}+");
+    private static final Pattern DIACRITICS_PATTERN = Pattern.compile("\\p{M}");
+
     private Utils() {
     } // utility class
 
@@ -976,30 +987,60 @@ static Sort fromKey(@Nullable String key, Sort defaultSort) {
         }
     }
 
-    private static final Pattern punctuationPattern = Pattern.compile("\\p{P}+");
-
     /**
-     * Strips all punctuation and converts to lower case.  A null parameter returns an empty string.
+     * Removes punctuation and converts text to lowercase. Returns an empty string if input is null.
      */
     public static String removePunctuationToLowercase(@Nullable CharSequence original) {
         if (original == null) return "";
-        return punctuationPattern.matcher(original).replaceAll("")
+        return PUNCTUATION_PATTERN.matcher(original).replaceAll("")
                 .toLowerCase(BaseSettings.REVANCED_LANGUAGE.get().getLocale());
     }
 
     /**
-     * Sort a PreferenceGroup and all it's sub groups by title or key.
+     * Normalizes text for search: applies NFD, removes diacritics, and lowercases (locale-neutral).
+     * Returns an empty string if input is null.
+     */
+    public static String normalizeTextToLowercase(@Nullable CharSequence original) {
+        if (original == null) return "";
+        return DIACRITICS_PATTERN.matcher(Normalizer.normalize(original, Normalizer.Form.NFD))
+                .replaceAll("").toLowerCase(Locale.ROOT);
+    }
+
+    /**
+     * Returns a cached Collator for the current locale, or creates a new one if locale changed.
+     */
+    private static Collator getCollator() {
+        Locale currentLocale = BaseSettings.REVANCED_LANGUAGE.get().getLocale();
+
+        if (cachedCollator == null || !currentLocale.equals(cachedCollatorLocale)) {
+            cachedCollatorLocale = currentLocale;
+            cachedCollator = Collator.getInstance(currentLocale);
+            cachedCollator.setStrength(Collator.SECONDARY); // Case-insensitive, diacritic-insensitive.
+        }
+
+        return cachedCollator;
+    }
+
+    /**
+     * Sorts a {@link PreferenceGroup} and all nested subgroups by title or key.
      * <p>
-     * Sort order is determined by the preferences key {@link Sort} suffix.
+     * The sort order is controlled by the {@link Sort} suffix present in the preference key.
+     * Preferences without a key or without a {@link Sort} suffix remain in their original order.
      * <p>
-     * If a preference has no key or no {@link Sort} suffix,
-     * then the preferences are left unsorted.
+     * Sorting is performed using {@link Collator} with the current user locale,
+     * ensuring correct alphabetical ordering for all supported languages
+     * (e.g., Ukrainian "і", German "ß", French accented characters, etc.).
+     *
+     * @param group the {@link PreferenceGroup} to sort
      */
     @SuppressWarnings("deprecation")
     public static void sortPreferenceGroups(PreferenceGroup group) {
         Sort groupSort = Sort.fromKey(group.getKey(), Sort.UNSORTED);
         List<Pair<String, Preference>> preferences = new ArrayList<>();
 
+        // Get cached Collator for locale-aware string comparison.
+        Collator collator = getCollator();
+
         for (int i = 0, prefCount = group.getPreferenceCount(); i < prefCount; i++) {
             Preference preference = group.getPreference(i);
 
@@ -1030,10 +1071,11 @@ public static void sortPreferenceGroups(PreferenceGroup group) {
             preferences.add(new Pair<>(sortValue, preference));
         }
 
-        //noinspection ComparatorCombinators
+        // Sort the list using locale-specific collation rules.
         Collections.sort(preferences, (pair1, pair2)
-                -> pair1.first.compareTo(pair2.first));
+                -> collator.compare(pair1.first, pair2.first));
 
+        // Reassign order values to reflect the new sorted sequence
         int index = 0;
         for (Pair<String, Preference> pair : preferences) {
             int order = index++;

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/Setting.java

@@ -392,10 +392,13 @@ public boolean isAvailable() {
 
     /**
      * Get the parent Settings that this setting depends on.
-     * @return List of parent Settings (e.g., BooleanSetting or EnumSetting), or empty list if no dependencies exist.
+     * @return List of parent Settings, or empty list if no dependencies exist.
+     *         Defensive: handles null availability or missing getParentSettings() override.
      */
     public List<Setting<?>> getParentSettings() {
-        return availability == null ? Collections.emptyList() : availability.getParentSettings();
+        return availability == null
+                ? Collections.emptyList()
+                : Objects.requireNonNullElse(availability.getParentSettings(), Collections.emptyList());
     }
 
     /**

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/search/BaseSearchResultItem.java

@@ -75,7 +75,7 @@ private static int getResourceIdentifier(String name) {
 
     // Shared method for highlighting text with search query.
     protected static CharSequence highlightSearchQuery(CharSequence text, Pattern queryPattern) {
-        if (TextUtils.isEmpty(text)) return text;
+        if (TextUtils.isEmpty(text) || queryPattern == null) return text;
 
         final int adjustedColor = Utils.adjustColorBrightness(
                 Utils.getAppBackgroundColor(), 0.95f, 1.20f);
@@ -84,7 +84,10 @@ protected static CharSequence highlightSearchQuery(CharSequence text, Pattern qu
 
         Matcher matcher = queryPattern.matcher(text);
         while (matcher.find()) {
-            spannable.setSpan(highlightSpan, matcher.start(), matcher.end(),
+            int start = matcher.start();
+            int end = matcher.end();
+            if (start == end) continue; // Skip zero matches.
+            spannable.setSpan(highlightSpan, start, end,
                     SpannableStringBuilder.SPAN_EXCLUSIVE_EXCLUSIVE);
         }
 
@@ -224,10 +227,14 @@ private String buildSearchableText(Preference pref) {
             return searchBuilder.toString();
         }
 
+        /**
+         * Appends normalized searchable text to the builder.
+         * Uses full Unicode normalization for accurate search across all languages.
+         */
         private void appendText(StringBuilder builder, CharSequence text) {
             if (!TextUtils.isEmpty(text)) {
                 if (builder.length() > 0) builder.append(" ");
-                builder.append(Utils.removePunctuationToLowercase(text));
+                builder.append(Utils.normalizeTextToLowercase(text));
             }
         }
 
@@ -272,7 +279,7 @@ public CharSequence getCurrentEffectiveSummary() {
          */
         @Override
         boolean matchesQuery(String query) {
-            return searchableText.contains(Utils.removePunctuationToLowercase(query));
+            return searchableText.contains(Utils.normalizeTextToLowercase(query));
         }
 
         /**

extensions/shared/library/src/main/java/app/revanced/extension/shared/settings/search/BaseSearchViewController.java

@@ -450,7 +450,7 @@ protected void filterAndShowResults(String query) {
 
         filteredSearchItems.clear();
 
-        String queryLower = Utils.removePunctuationToLowercase(query);
+        String queryLower = Utils.normalizeTextToLowercase(query);
         Pattern queryPattern = Pattern.compile(Pattern.quote(queryLower), Pattern.CASE_INSENSITIVE);
 
         // Clear highlighting only for items that were previously visible.

extensions/youtube/src/main/java/app/revanced/extension/youtube/patches/spoof/SpoofVideoStreamsPatch.java

@@ -22,6 +22,11 @@ public boolean isAvailable() {
             return Settings.SPOOF_VIDEO_STREAMS_CLIENT_TYPE.isAvailable()
                     && Settings.SPOOF_VIDEO_STREAMS_CLIENT_TYPE.get() == ANDROID_VR_1_43_32;
         }
+
+        @Override
+        public List<Setting<?>> getParentSettings() {
+            return List.of(Settings.SPOOF_VIDEO_STREAMS_CLIENT_TYPE);
+        }
     }
 
     /**