Fix back navigation from conversation settings sub-screens popping to the chat.

app/src/main/java/org/thoughtcrime/securesms/components/settings/conversation/ConversationSettingsNavHostFragment.kt

@@ -9,13 +9,17 @@ import android.os.Bundle
 import androidx.core.os.bundleOf
 import androidx.navigation.fragment.NavHostFragment
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.withContext
 import org.thoughtcrime.securesms.R
 import org.thoughtcrime.securesms.components.settings.DSLSettingsActivity
+import org.thoughtcrime.securesms.compose.FragmentBackPressedInfo
+import org.thoughtcrime.securesms.compose.FragmentBackPressedInfoProvider
 import org.thoughtcrime.securesms.recipients.Recipient
 import org.thoughtcrime.securesms.recipients.RecipientId
 
-class ConversationSettingsNavHostFragment : NavHostFragment() {
+class ConversationSettingsNavHostFragment : NavHostFragment(), FragmentBackPressedInfoProvider {
 
   companion object {
     suspend fun createArgs(recipientId: RecipientId): Bundle {
@@ -36,4 +40,14 @@ class ConversationSettingsNavHostFragment : NavHostFragment() {
     navController.setGraph(R.navigation.conversation_settings, args)
     super.onCreate(savedInstanceState)
   }
+
+  override fun getFragmentBackPressedInfo(): Flow<FragmentBackPressedInfo> {
+    return navController.currentBackStackEntryFlow.map {
+      if (navController.previousBackStackEntry != null) {
+        FragmentBackPressedInfo.Enabled { navController.popBackStack() }
+      } else {
+        FragmentBackPressedInfo.Disabled
+      }
+    }
+  }
 }

app/src/main/java/org/thoughtcrime/securesms/main/ChatsNavHost.kt

@@ -197,6 +197,9 @@ fun NavGraphBuilder.chatNavGraphBuilder(
     }
 
     arguments?.let { args ->
+      val backPressedState = remember { FragmentBackPressedState() }
+      FragmentBackHandler(backPressedState)
+
       AndroidFragment(
         clazz = ConversationSettingsNavHostFragment::class.java,
         fragmentState = fragmentState,
@@ -206,7 +209,9 @@ fun NavGraphBuilder.chatNavGraphBuilder(
           .background(MaterialTheme.colorScheme.background)
           .statusBarsPadding()
           .navigationBarsPadding()
-      )
+      ) { fragment ->
+        backPressedState.attach(fragment)
+      }
     }
   }
 }