[fenix] Put the Start On home setting behind a feature flag.

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

@@ -34,6 +34,11 @@ object FeatureFlags {
      */
     val showHomeButtonFeature = Config.channel.isNightlyOrDebug
 
+    /**
+     * Enables the Start On Home feature in the settings page.
+     */
+    val showStartOnHomeSettings = Config.channel.isNightlyOrDebug
+
     /**
      * Enables the "recent" tabs feature in the home screen.
      */

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

@@ -220,7 +220,7 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
             shouldNavigateBrowserFragmentOnCouldStart(savedInstanceState)
         ) {
             navigateToBrowserOnColdStart()
-        } else {
+        } else if (FeatureFlags.showStartOnHomeSettings) {
             components.analytics.metrics.track(Event.StartOnHomeEnterHomeScreen)
         }
 
@@ -974,6 +974,9 @@ open class HomeActivity : LocaleAwareAppCompatActivity(), NavHostActivity {
      *  links from an external apps should always opened in the [BrowserFragment].
      */
     fun shouldStartOnHome(intent: Intent? = this.intent): Boolean {
+        if (!FeatureFlags.showStartOnHomeSettings) {
+            return false
+        }
         return components.strictMode.resetAfter(StrictMode.allowThreadDiskReads()) {
             // We only want to open on home when users tap the app,
             // we want to ignore other cases when the app gets open by users clicking on links.

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -461,7 +461,9 @@ class HomeFragment : Fragment() {
             }
 
             view.tab_button.setOnClickListener {
-                requireComponents.analytics.metrics.track(Event.StartOnHomeOpenTabsTray)
+                if (FeatureFlags.showStartOnHomeSettings) {
+                    requireComponents.analytics.metrics.track(Event.StartOnHomeOpenTabsTray)
+                }
                 openTabsTray()
             }
 

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

@@ -6,7 +6,9 @@ package org.mozilla.fenix.settings
 
 import android.os.Bundle
 import android.view.View
+import androidx.preference.PreferenceCategory
 import androidx.preference.PreferenceFragmentCompat
+import org.mozilla.fenix.FeatureFlags
 import org.mozilla.fenix.R
 import org.mozilla.fenix.components.metrics.Event
 import org.mozilla.fenix.ext.components
@@ -56,10 +58,14 @@ class TabsSettingsFragment : PreferenceFragmentCompat() {
         radioOneWeek = requirePreference(R.string.pref_key_close_tabs_after_one_week)
         radioOneMonth = requirePreference(R.string.pref_key_close_tabs_after_one_month)
 
+        startOnHomeRadioFourHours = requirePreference(R.string.pref_key_start_on_home_after_four_hours)
         startOnHomeRadioFourHours = requirePreference(R.string.pref_key_start_on_home_after_four_hours)
         startOnHomeRadioAlways = requirePreference(R.string.pref_key_start_on_home_always)
         startOnHomeRadioNever = requirePreference(R.string.pref_key_start_on_home_never)
 
+        requirePreference<PreferenceCategory>(R.string.pref_key_start_on_home_category).isVisible =
+            FeatureFlags.showStartOnHomeSettings
+
         setupRadioGroups()
     }
 

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

@@ -268,6 +268,7 @@
     <string name="pref_key_start_on_home_after_four_hours" translatable="false">pref_key_start_on_home_after_four_hours</string>
     <string name="pref_key_start_on_home_always" translatable="false">pref_key_start_on_home_always</string>
     <string name="pref_key_start_on_home_never" translatable="false">pref_key_start_on_home_never</string>
+    <string name="pref_key_start_on_home_category" translatable="false">pref_key_start_on_home_category</string>
     <string name="pref_key_camera_permissions_needed" translatable="false">pref_key_camera_permissions_needed</string>
 
     <string name="pref_key_return_to_browser" translatable="false">pref_key_return_to_browser</string>

app/src/main/res/xml/tabs_preferences.xml

@@ -50,6 +50,8 @@
         android:layout="@layout/preference_cat_style"
         android:title="@string/preferences_start_on_home"
         app:allowDividerAbove="true"
+        app:isPreferenceVisible="false"
+        android:key="pref_key_start_on_home_category"
         app:iconSpaceReserved="false">
 
         <org.mozilla.fenix.settings.RadioButtonPreference