Migrate extensions language filter screen to compose (#7169)

app/src/main/java/eu/kanade/domain/extension/interactor/GetExtensionLanguages.kt

@@ -0,0 +1,30 @@
+package eu.kanade.domain.extension.interactor
+
+import eu.kanade.core.util.asFlow
+import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.extension.ExtensionManager
+import eu.kanade.tachiyomi.util.system.LocaleHelper
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.combine
+
+class GetExtensionLanguages(
+    private val preferences: PreferencesHelper,
+    private val extensionManager: ExtensionManager,
+) {
+    fun subscribe(): Flow<List<String>> {
+        return combine(
+            preferences.enabledLanguages().asFlow(),
+            extensionManager.getAvailableExtensionsObservable().asFlow(),
+        ) { enabledLanguage, availableExtensions ->
+            availableExtensions
+                .map { it.lang }
+                .distinct()
+                .sortedWith(
+                    compareBy(
+                        { it !in enabledLanguage },
+                        { LocaleHelper.getDisplayName(it) },
+                    ),
+                )
+        }
+    }
+}