Address PR review comments.

- use util startNotificationSettingsIntent.
- add documentation.
- use remember with userPushStoreFactory for recomposition.

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/notifications/NotificationSettingsNode.kt

@@ -49,7 +49,7 @@ class NotificationSettingsNode @AssistedInject constructor(
         val state = presenter.present()
         NotificationSettingsView(
             state = state,
-            onOpenEditDefault = { openEditDefault(it) },
+            onOpenEditDefault = { openEditDefault(isOneToOne = it) },
             onBackPressed = ::navigateUp,
             modifier = modifier,
         )

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/notifications/NotificationSettingsPresenter.kt

@@ -46,7 +46,7 @@ class NotificationSettingsPresenter @Inject constructor(
 ) : Presenter<NotificationSettingsState> {
     @Composable
     override fun present(): NotificationSettingsState {
-        val userPushStore = userPushStoreFactory.create(matrixClient.sessionId)
+        val userPushStore = remember { userPushStoreFactory.create(matrixClient.sessionId) }
         val systemNotificationsEnabled: MutableState<Boolean> = remember {
             mutableStateOf(systemNotificationsEnabledProvider.notificationsEnabled())
         }

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/notifications/NotificationSettingsView.kt

@@ -39,6 +39,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.Lifecycle
+import io.element.android.libraries.androidutils.system.startNotificationSettingsIntent
 import io.element.android.libraries.designsystem.components.dialogs.ErrorDialog
 import io.element.android.libraries.designsystem.components.preferences.PreferenceCategory
 import io.element.android.libraries.designsystem.components.preferences.PreferenceSwitch
@@ -55,10 +56,13 @@ import io.element.android.libraries.matrix.api.room.RoomNotificationMode
 import io.element.android.libraries.theme.ElementTheme
 import io.element.android.libraries.ui.strings.CommonStrings
 
+/**
+ * A view that allows a user edit their global notification settings.
+ */
 @Composable
 fun NotificationSettingsView(
     state: NotificationSettingsState,
-    onOpenEditDefault: (Boolean) -> Unit,
+    onOpenEditDefault: (isOneToOne: Boolean) -> Unit,
     onBackPressed: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
@@ -113,11 +117,7 @@ private fun NotificationSettingsContentView(
                 subtitle = stringResource(id = CommonStrings.screen_notification_settings_system_notifications_action_required,
                     stringResource(id = CommonStrings.screen_notification_settings_system_notifications_action_required_content_link)),
                 onClick = {
-                    val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
-                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
-                    val uri: Uri = Uri.fromParts("package", context.packageName, null)
-                    intent.data = uri
-                    context.startActivity(intent)
+                    context.startNotificationSettingsIntent()
                 }
             )
         }

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/notifications/edit/DefaultNotificationSettingOption.kt

@@ -80,7 +80,7 @@ fun DefaultNotificationSettingOption(
 }
 @DayNightPreviews
 @Composable
-internal fun DefaultNotificationSettingOptionLightPreview() = ElementPreview { ContentToPreview() }
+internal fun DefaultNotificationSettingOptionPreview() = ElementPreview { ContentToPreview() }
 
 @Composable
 private fun ContentToPreview() {

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/notifications/edit/EditDefaultNotificationSettingPresenter.kt

@@ -84,6 +84,7 @@ class EditDefaultNotificationSettingPresenter @AssistedInject constructor(
     }
 
     private fun CoroutineScope.setDefaultNotificationMode(mode: RoomNotificationMode) = launch {
+        // On modern clients, we don't have different settings for encrypted and non-encrypted rooms (Legacy clients did).
         notificationSettingsService.setDefaultRoomNotificationMode(isEncrypted = true, mode = mode, isOneToOne = isOneToOne)
         notificationSettingsService.setDefaultRoomNotificationMode(isEncrypted = false, mode = mode, isOneToOne = isOneToOne)
     }

features/preferences/impl/src/main/kotlin/io/element/android/features/preferences/impl/notifications/edit/EditDefaultNotificationSettingView.kt

@@ -26,6 +26,10 @@ import io.element.android.libraries.designsystem.components.preferences.Preferen
 import io.element.android.libraries.matrix.api.room.RoomNotificationMode
 import io.element.android.libraries.ui.strings.CommonStrings
 
+/**
+ * A view that allows a user to edit the default notification setting for rooms. This can be set separately
+ * for one-to-one and group rooms, indicated by [EditDefaultNotificationSettingState.isOneToOne].
+ */
 @Composable
 fun EditDefaultNotificationSettingView(
     state: EditDefaultNotificationSettingState,
@@ -44,6 +48,7 @@ fun EditDefaultNotificationSettingView(
         title = stringResource(id = title)
     ) {
 
+        // Only ALL_MESSAGES and MENTIONS_AND_KEYWORDS_ONLY are valid global defaults.
         val validModes = listOf(RoomNotificationMode.ALL_MESSAGES, RoomNotificationMode.MENTIONS_AND_KEYWORDS_ONLY)
 
         val categoryTitle = if(state.isOneToOne) {

libraries/androidutils/src/main/kotlin/io/element/android/libraries/androidutils/system/SystemUtils.kt

@@ -122,7 +122,7 @@ fun Context.copyToClipboard(
  * Shows notification settings for the current app.
  * In android O will directly opens the notification settings, in lower version it will show the App settings
  */
-fun Context.startNotificationSettingsIntent(activityResultLauncher: ActivityResultLauncher<Intent>) {
+fun Context.startNotificationSettingsIntent(activityResultLauncher: ActivityResultLauncher<Intent>? = null) {
     val intent = Intent()
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
         intent.action = Settings.ACTION_APP_NOTIFICATION_SETTINGS
@@ -132,7 +132,12 @@ fun Context.startNotificationSettingsIntent(activityResultLauncher: ActivityResu
         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
         intent.data = Uri.fromParts("package", packageName, null)
     }
-    activityResultLauncher.launch(intent)
+
+    if (activityResultLauncher != null) {
+        activityResultLauncher.launch(intent)
+    } else {
+        startActivity(intent)
+    }
 }
 
 fun Context.openAppSettingsPage(