[fenix] For https://github.com/mozilla-mobile/fenix/issues/1084 - Update TP Policy for the current engineSession

app/src/main/java/org/mozilla/fenix/components/Core.kt

@@ -135,7 +135,7 @@ class Core(private val context: Context) {
      * in private browsing mode, default to the current preference value.
      * @return the constructed tracking protection policy based on preferences.
      */
-    private fun createTrackingProtectionPolicy(
+    fun createTrackingProtectionPolicy(
         normalMode: Boolean = Settings.getInstance(context).shouldUseTrackingProtection,
         privateMode: Boolean = true
     ): TrackingProtectionPolicy {
@@ -153,11 +153,6 @@ class Core(private val context: Context) {
         }
     }
 
-    fun updateTrackingProtection(newValue: Boolean) {
-        engine.settings.trackingProtectionPolicy =
-            createTrackingProtectionPolicy(normalMode = newValue)
-    }
-
     /**
      * Sets Preferred Color scheme based on Dark/Light Theme Settings or Current Configuration
      */

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

@@ -31,7 +31,15 @@ class TrackingProtectionFragment : PreferenceFragmentCompat() {
         val preferenceTP = findPreference<Preference>(trackingProtectionKey)
         preferenceTP?.onPreferenceChangeListener =
             Preference.OnPreferenceChangeListener { _, newValue ->
-                requireComponents.core.updateTrackingProtection(newValue as Boolean)
+                with(requireComponents.core) {
+                    val policy =
+                        createTrackingProtectionPolicy(newValue as Boolean)
+                    engine.settings.trackingProtectionPolicy = policy
+
+                    with(sessionManager) {
+                        sessions.forEach { getEngineSession(it)?.enableTrackingProtection(policy) }
+                    }
+                }
                 true
             }