Add back protection dialog on recovery key screen.

app/src/main/java/org/thoughtcrime/securesms/backup/v2/ui/subscription/MessageBackupsKeyRecordScreen.kt

@@ -6,6 +6,8 @@
 package org.thoughtcrime.securesms.backup.v2.ui.subscription
 
 import android.content.Context
+import androidx.activity.compose.BackHandler
+import androidx.activity.compose.LocalOnBackPressedDispatcherOwner
 import androidx.annotation.UiContext
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -94,6 +96,10 @@ fun MessageBackupsKeyRecordScreen(
     backupKey.chunked(4).joinToString("  ")
   }
 
+  if (mode is MessageBackupsKeyRecordMode.Next) {
+    RecordScreenBackHandler()
+  }
+
   Scaffolds.Settings(
     title = "",
     navigationIcon = ImageVector.vectorResource(R.drawable.symbol_arrow_start_24),
@@ -338,6 +344,38 @@ private fun BackupKeySaveErrorDialog(
   }
 }
 
+@Composable
+private fun RecordScreenBackHandler() {
+  var displayWarningDialog by remember { mutableStateOf(false) }
+  var didConfirmDialog by remember { mutableStateOf(false) }
+  val backPressedDispatcher = LocalOnBackPressedDispatcherOwner.current?.onBackPressedDispatcher
+
+  BackHandler(enabled = !didConfirmDialog) {
+    displayWarningDialog = true
+  }
+
+  LaunchedEffect(didConfirmDialog, backPressedDispatcher) {
+    if (didConfirmDialog) {
+      backPressedDispatcher?.onBackPressed()
+    }
+  }
+
+  if (displayWarningDialog) {
+    Dialogs.SimpleAlertDialog(
+      title = stringResource(R.string.MessageBackupsKeyRecordScreen__exit_backup_setup),
+      body = stringResource(R.string.MessageBackupsKeyRecordScreen__you_have_not_finished_setting_up_backups),
+      confirm = stringResource(R.string.MessageBackupsKeyRecordScreen__exit_backup_setup_confirm),
+      dismiss = stringResource(android.R.string.cancel),
+      onConfirm = {
+        didConfirmDialog = true
+      },
+      onDismiss = {
+        displayWarningDialog = false
+      }
+    )
+  }
+}
+
 @Composable
 private fun ColumnScope.CreateNewBackupKeySheetContent(
   onContinueClick: () -> Unit = {},