[fenix] Closes mozilla-mobilehttps://github.com/mozilla-mobile/fenix/issues/26733 Language search doesn't reset to full list view anymore

app/src/main/java/org/mozilla/fenix/settings/advanced/LocaleSettingsStore.kt

@@ -60,7 +60,7 @@ private fun localeSettingsStateReducer(
 ): LocaleSettingsState {
     return when (action) {
         is LocaleSettingsAction.Select -> {
-            state.copy(selectedLocale = action.selectedItem)
+            state.copy(selectedLocale = action.selectedItem, searchedLocaleList = state.localeList)
         }
         is LocaleSettingsAction.Search -> {
             val searchedItems = state.localeList.filter {

app/src/test/java/org/mozilla/fenix/settings/advanced/LocaleSettingsStoreTest.kt

@@ -42,4 +42,15 @@ class LocaleSettingsStoreTest {
         assertEquals(2, (localeSettingsStore.state.searchedLocaleList as ArrayList).size)
         assertEquals(selectedLocale, localeSettingsStore.state.searchedLocaleList[1])
     }
+
+    @Test
+    fun `GIVEN search list is amended WHEN locale selected THEN reset search list`() = runTest {
+        localeSettingsStore.dispatch(LocaleSettingsAction.Search("Eng")).join()
+        assertEquals(2, (localeSettingsStore.state.searchedLocaleList as ArrayList).size)
+
+        localeSettingsStore.dispatch(LocaleSettingsAction.Search("fr")).join()
+        localeSettingsStore.dispatch(LocaleSettingsAction.Select(otherLocale)).join()
+
+        assertEquals(localeSettingsStore.state.localeList.size, localeSettingsStore.state.searchedLocaleList.size)
+    }
 }