Fix notifications undo system (2/2)

Adjust so NotficationSettingsRepository in frameworks/base emits the
show notifications boolean in a suspend function, after it is retrieved
from SecureSettingsRepository, instead of returning a default value
immediately.

Flag: EXEMPT bug fix
Bug: 326440143
Test: manually verified notifications toggle sets and resets correctly
Test: manually verified reset button shows and hides correctly
Test: existing notifications unit tests pass
Test: new ThemePicker test NotificationsSnapshotRestorerTest
Change-Id: If580a54fdb920a6a17f7c605caf5359a868f0ec0
diff --git a/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepository.kt b/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepository.kt
index e39d7ed..9e857deb 100644
--- a/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepository.kt
+++ b/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepository.kt
@@ -21,16 +21,16 @@
 import kotlinx.coroutines.CoroutineDispatcher
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.distinctUntilChanged
+import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.withContext
 
 /** Provides access to state related to notification settings. */
 class NotificationSettingsRepository(
-    scope: CoroutineScope,
+    private val scope: CoroutineScope,
     private val backgroundDispatcher: CoroutineDispatcher,
     private val secureSettingsRepository: SecureSettingsRepository,
 ) {
@@ -41,16 +41,15 @@
             .distinctUntilChanged()
 
     /** The current state of the notification setting. */
-    val isShowNotificationsOnLockScreenEnabled: StateFlow<Boolean> =
+    suspend fun isShowNotificationsOnLockScreenEnabled(): StateFlow<Boolean> =
         secureSettingsRepository
             .intSetting(
                 name = Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS,
             )
             .map { it == 1 }
+            .flowOn(backgroundDispatcher)
             .stateIn(
                 scope = scope,
-                started = SharingStarted.WhileSubscribed(),
-                initialValue = false,
             )
 
     suspend fun setShowNotificationsOnLockscreenEnabled(enabled: Boolean) {
diff --git a/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/domain/interactor/NotificationSettingsInteractor.kt b/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/domain/interactor/NotificationSettingsInteractor.kt
index 04e8090..b4105bd 100644
--- a/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/domain/interactor/NotificationSettingsInteractor.kt
+++ b/packages/SystemUI/customization/src/com/android/systemui/shared/notifications/domain/interactor/NotificationSettingsInteractor.kt
@@ -26,8 +26,8 @@
     val isNotificationHistoryEnabled = repository.isNotificationHistoryEnabled
 
     /** Should notifications be visible on the lockscreen? */
-    val isShowNotificationsOnLockScreenEnabled: StateFlow<Boolean> =
-        repository.isShowNotificationsOnLockScreenEnabled
+    suspend fun isShowNotificationsOnLockScreenEnabled(): StateFlow<Boolean> =
+        repository.isShowNotificationsOnLockScreenEnabled()
 
     suspend fun setShowNotificationsOnLockscreenEnabled(enabled: Boolean) {
         repository.setShowNotificationsOnLockscreenEnabled(enabled)
@@ -35,7 +35,7 @@
 
     /** Toggles the setting to show or hide notifications on the lock screen. */
     suspend fun toggleShowNotificationsOnLockscreenEnabled() {
-        val current = repository.isShowNotificationsOnLockScreenEnabled.value
+        val current = repository.isShowNotificationsOnLockScreenEnabled().value
         repository.setShowNotificationsOnLockscreenEnabled(!current)
     }
 }
diff --git a/packages/SystemUI/tests/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepositoryTest.kt b/packages/SystemUI/tests/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepositoryTest.kt
index 0dd988d..40f7b7fb 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepositoryTest.kt
+++ b/packages/SystemUI/tests/src/com/android/systemui/shared/notifications/data/repository/NotificationSettingsRepositoryTest.kt
@@ -56,7 +56,7 @@
     @Test
     fun testGetIsShowNotificationsOnLockscreenEnabled() =
         testScope.runTest {
-            val showNotifs by collectLastValue(underTest.isShowNotificationsOnLockScreenEnabled)
+            val showNotifs by collectLastValue(underTest.isShowNotificationsOnLockScreenEnabled())
 
             secureSettingsRepository.setInt(
                 name = Settings.Secure.LOCK_SCREEN_SHOW_NOTIFICATIONS,
@@ -74,7 +74,7 @@
     @Test
     fun testSetIsShowNotificationsOnLockscreenEnabled() =
         testScope.runTest {
-            val showNotifs by collectLastValue(underTest.isShowNotificationsOnLockScreenEnabled)
+            val showNotifs by collectLastValue(underTest.isShowNotificationsOnLockScreenEnabled())
 
             underTest.setShowNotificationsOnLockscreenEnabled(true)
             assertThat(showNotifs).isEqualTo(true)