Fix back navigation issue, when opening directly the notification troubleshoot screen.

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

@@ -44,6 +44,7 @@ import io.element.android.features.preferences.impl.root.PreferencesRootNode
 import io.element.android.features.preferences.impl.user.editprofile.EditUserProfileNode
 import io.element.android.libraries.architecture.BackstackView
 import io.element.android.libraries.architecture.BaseFlowNode
+import io.element.android.libraries.architecture.appyx.canPop
 import io.element.android.libraries.architecture.createNode
 import io.element.android.libraries.di.SessionScope
 import io.element.android.libraries.matrix.api.core.RoomId
@@ -190,7 +191,11 @@ class PreferencesFlowNode @AssistedInject constructor(
                 notificationTroubleShootEntryPoint.nodeBuilder(this, buildContext)
                     .callback(object : NotificationTroubleShootEntryPoint.Callback {
                         override fun onDone() {
-                            backstack.pop()
+                            if (backstack.canPop()) {
+                                backstack.pop()
+                            } else {
+                                navigateUp()
+                            }
                         }
                     })
                     .build()

libraries/architecture/src/main/kotlin/io/element/android/libraries/architecture/appyx/BackStackExt.kt

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.architecture.appyx
+
+import com.bumble.appyx.navmodel.backstack.BackStack
+
+fun <T : Any> BackStack<T>.canPop(): Boolean {
+    val elements = elements.value
+    return elements.any { it.targetState == BackStack.State.ACTIVE } &&
+        elements.any { it.targetState == BackStack.State.STASHED }
+}