Fix crash when clicking fast on back key on the Add account screen.

appnav/src/main/kotlin/io/element/android/appnav/NotLoggedInFlowNode.kt

@@ -57,6 +57,7 @@ class NotLoggedInFlowNode(
 
     interface Callback : Plugin {
         fun navigateToBugReport()
+        fun onDone()
     }
 
     private val callback: Callback = callback()
@@ -83,6 +84,10 @@ class NotLoggedInFlowNode(
                     override fun navigateToBugReport() {
                         callback.navigateToBugReport()
                     }
+
+                    override fun onDone() {
+                        callback.onDone()
+                    }
                 }
                 loginEntryPoint.createNode(
                     parentNode = this,

appnav/src/main/kotlin/io/element/android/appnav/RootFlowNode.kt

@@ -243,6 +243,10 @@ class RootFlowNode(
                     override fun navigateToBugReport() {
                         backstack.push(NavTarget.BugReport)
                     }
+
+                    override fun onDone() {
+                        backstack.pop()
+                    }
                 }
                 val params = NotLoggedInFlowNode.Params(
                     loginParams = navTarget.params,

features/login/api/src/main/kotlin/io/element/android/features/login/api/LoginEntryPoint.kt

@@ -21,6 +21,7 @@ interface LoginEntryPoint : FeatureEntryPoint {
 
     interface Callback : Plugin {
         fun navigateToBugReport()
+        fun onDone()
     }
 
     fun createNode(

features/login/impl/src/main/kotlin/io/element/android/features/login/impl/LoginFlowNode.kt

@@ -167,6 +167,10 @@ class LoginFlowNode(
                     override fun navigateToLoginPassword() {
                         backstack.push(NavTarget.LoginPassword)
                     }
+
+                    override fun onDone() {
+                        callback.onDone()
+                    }
                 }
                 val params = inputs<Params>()
                 val inputs = OnBoardingNode.Params(

features/login/impl/src/main/kotlin/io/element/android/features/login/impl/screens/onboarding/OnBoardingNode.kt

@@ -42,6 +42,7 @@ class OnBoardingNode(
         fun navigateToLoginPassword()
         fun navigateToOidc(oidcDetails: OidcDetails)
         fun navigateToCreateAccount(url: String)
+        fun onDone()
     }
 
     data class Params(
@@ -71,7 +72,7 @@ class OnBoardingNode(
             onNeedLoginPassword = callback::navigateToLoginPassword,
             onLearnMoreClick = { openLearnMorePage(context) },
             onCreateAccountContinue = callback::navigateToCreateAccount,
-            onBackClick = ::navigateUp,
+            onBackClick = callback::onDone,
         )
     }
 }