Fix LocaleComparator

app/src/main/kotlin/org/koitharu/kotatsu/core/util/LocaleComparator.kt

@@ -4,23 +4,20 @@ import androidx.core.os.LocaleListCompat
 import org.koitharu.kotatsu.core.util.ext.map
 import java.util.Locale
 
-class LocaleComparator : Comparator<Locale?> {
+class LocaleComparator : Comparator<Locale> {
 
 	private val deviceLocales = LocaleListCompat.getAdjustedDefault()//LocaleManagerCompat.getSystemLocales(context)
 		.map { it.language }
 		.distinct()
 
-	override fun compare(a: Locale?, b: Locale?): Int {
-		return if (a === b) {
-			0
-		} else {
-			val indexA = if (a == null) -1 else deviceLocales.indexOf(a.language)
-			val indexB = if (b == null) -1 else deviceLocales.indexOf(b.language)
-			if (indexA < 0 && indexB < 0) {
-				compareValues(a?.language, b?.language)
-			} else {
-				-2 - (indexA - indexB)
-			}
+	override fun compare(a: Locale, b: Locale): Int {
+		val indexA = deviceLocales.indexOf(a.language)
+		val indexB = deviceLocales.indexOf(b.language)
+		return when {
+			indexA < 0 && indexB < 0 -> compareValues(a.language, b.language)
+			indexA < 0 -> 1
+			indexB < 0 -> -1
+			else -> compareValues(indexA, indexB)
 		}
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/onboard/OnboardViewModel.kt

@@ -6,7 +6,7 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.MutableStateFlow
 import org.koitharu.kotatsu.core.ui.BaseViewModel
-import org.koitharu.kotatsu.core.util.ext.map
+import org.koitharu.kotatsu.core.util.LocaleComparator
 import org.koitharu.kotatsu.core.util.ext.mapToSet
 import org.koitharu.kotatsu.core.util.ext.sortedWithSafe
 import org.koitharu.kotatsu.explore.data.MangaSourcesRepository
@@ -70,9 +70,7 @@ class OnboardViewModel @Inject constructor(
 		}
 		repository.setSourcesEnabledExclusive(enabledSources)
 		list.value = locales.map { (key, srcs) ->
-			val locale = if (key != null) {
-				Locale(key)
-			} else null
+			val locale = key?.let { Locale(it) }
 			SourceLocale(
 				key = key,
 				title = locale?.getDisplayLanguage(locale)?.toTitleCase(locale),
@@ -82,26 +80,14 @@ class OnboardViewModel @Inject constructor(
 		}.sortedWithSafe(SourceLocaleComparator())
 	}
 
-	private class SourceLocaleComparator : Comparator<SourceLocale?> {
+	private class SourceLocaleComparator : Comparator<SourceLocale> {
 
-		private val deviceLocales = LocaleListCompat.getAdjustedDefault()
-			.map { it.language }
+		private val delegate = nullsFirst(LocaleComparator())
 
-		override fun compare(a: SourceLocale?, b: SourceLocale?): Int {
-			return when {
-				a === b -> 0
-				a?.key == null -> 1
-				b?.key == null -> -1
-				else -> {
-					val indexA = deviceLocales.indexOf(a.key)
-					val indexB = deviceLocales.indexOf(b.key)
-					if (indexA == -1 && indexB == -1) {
-						compareValues(a.title, b.title)
-					} else {
-						-2 - (indexA - indexB)
-					}
-				}
-			}
+		override fun compare(a: SourceLocale, b: SourceLocale): Int {
+			val localeA = a.key?.let { Locale(it) }
+			val localeB = b.key?.let { Locale(it) }
+			return delegate.compare(localeA, localeB)
 		}
 	}
 }