[fenix] For https://github.com/mozilla-mobile/fenix/issues/24334 - Add FeatureFlag for Unified Search feature

app/src/main/java/org/mozilla/fenix/FeatureFlags.kt

@@ -104,4 +104,9 @@ object FeatureFlags {
      * Enables the Task Continuity enhancements.
      */
     val taskContinuityFeature = Config.channel.isDebug
+
+    /**
+     * Enables the Unified Search feature.
+     */
+    val unifiedSearchFeature = Config.channel.isNightlyOrDebug
 }

app/src/main/java/org/mozilla/fenix/search/toolbar/ToolbarView.kt

@@ -53,7 +53,7 @@ interface ToolbarInteractor {
 @Suppress("LongParameterList")
 class ToolbarView(
     private val context: Context,
-    settings: Settings,
+    private val settings: Settings,
     private val interactor: ToolbarInteractor,
     private val historyStorage: HistoryStorage?,
     private val isPrivate: Boolean,
@@ -152,7 +152,7 @@ class ToolbarView(
 
         val searchEngine = searchState.searchEngineSource.searchEngine
 
-        if (searchEngine != null) {
+        if (!settings.showUnifiedSearchFeature && searchEngine != null) {
             val iconSize =
                 context.resources.getDimensionPixelSize(R.dimen.preference_icon_drawable_size)
 

app/src/main/java/org/mozilla/fenix/settings/SecretSettingsFragment.kt

@@ -59,5 +59,11 @@ class SecretSettingsFragment : PreferenceFragmentCompat() {
             isChecked = context.settings().enableTaskContinuityEnhancements
             onPreferenceChangeListener = SharedPreferenceUpdater()
         }
+
+        requirePreference<SwitchPreference>(R.string.pref_key_show_unified_search).apply {
+            isVisible = FeatureFlags.unifiedSearchFeature
+            isChecked = context.settings().showUnifiedSearchFeature
+            onPreferenceChangeListener = SharedPreferenceUpdater()
+        }
     }
 }

app/src/main/java/org/mozilla/fenix/utils/Settings.kt

@@ -1290,6 +1290,15 @@ class Settings(private val appContext: Context) : PreferencesHolder {
         featureFlag = FeatureFlags.taskContinuityFeature,
     )
 
+    /**
+     * Indicates if the Unified Search feature should be visible.
+     */
+    var showUnifiedSearchFeature by featureFlagPreference(
+        key = appContext.getPreferenceKey(R.string.pref_key_show_unified_search),
+        default = false,
+        featureFlag = FeatureFlags.unifiedSearchFeature
+    )
+
     /**
      * Blocklist used to filter items from the home screen that have previously been removed.
      */

app/src/main/res/values/preference_keys.xml

@@ -282,4 +282,5 @@
     <string name="pref_key_nimbus_use_preview" translatable="false">pref_key_nimbus_use_preview</string>
     <string name="pref_key_history_metadata_feature" translatable="false">pref_key_history_metadata_feature</string>
     <string name="pref_key_pocket_homescreen_recommendations" translatable="false">pref_key_pocket_homescreen_recommendations</string>
+    <string name="pref_key_show_unified_search" translatable="false">pref_key_show_unified_search</string>
 </resources>

app/src/main/res/values/static_strings.xml

@@ -45,6 +45,8 @@
     <string name="preferences_nimbus_use_preview_collection">Use Nimbus Preview Collection (requires restart)</string>
     <!-- Label for enabling the Task Continuity feature -->
     <string name="preferences_debug_settings_task_continuity" translatable="false">Enable Task Continuity</string>
+    <!-- Label for enabling the Unified Search feature -->
+    <string name="preferences_debug_settings_unified_search" translatable="false">Enable Unified Search</string>
 
     <!-- A secret menu option in the tabs tray for making a tab inactive for testing. -->
     <string name="inactive_tabs_menu_item">Make inactive</string>

app/src/main/res/xml/secret_settings_preferences.xml

@@ -30,4 +30,9 @@
         android:key="@string/pref_key_enable_task_continuity"
         android:title="@string/preferences_debug_settings_task_continuity"
         app:iconSpaceReserved="false" />
+    <SwitchPreference
+        android:defaultValue="false"
+        android:key="@string/pref_key_show_unified_search"
+        android:title="@string/preferences_debug_settings_unified_search"
+        app:iconSpaceReserved="false" />
 </PreferenceScreen>