For #4529, #4427: Resuming after restoring instance state breaks UI (#4571)

* For #4529, #4427: Resuming after restoring instance state breaks UI

* Clear up warnings

CHANGELOG.md

@@ -8,7 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - #4137 - Adds pagination to the history view
 - #3695 - Made search suggestions for other tabs clickable
+
+### Changed
 - Remove forced focus of toolbar on homescreen
+- #4529 - Fixed an issue where the app would sometimes return to a blank toolbar
+- #4427 - Fixed an issue where the app would sometimes return to the home fragment
+
+### Removed
 
 ## [1.1.0 and earlier] - 2019-07-23
 ### Added

app/src/main/java/org/mozilla/fenix/FenixViewModelProvider.kt

@@ -7,10 +7,10 @@ package org.mozilla.fenix
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
-import org.mozilla.fenix.mvi.ViewState
 import org.mozilla.fenix.mvi.Change
 import org.mozilla.fenix.mvi.UIComponentViewModelBase
 import org.mozilla.fenix.mvi.UIComponentViewModelProvider
+import org.mozilla.fenix.mvi.ViewState
 
 object FenixViewModelProvider {
     fun <S : ViewState, C : Change, T : UIComponentViewModelBase<S, C>> create(

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -15,7 +15,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.coordinatorlayout.widget.CoordinatorLayout
 import androidx.core.net.toUri
 import androidx.fragment.app.Fragment
-import androidx.lifecycle.ViewModelProvider
+import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.findNavController
 import com.google.android.material.bottomsheet.BottomSheetBehavior
@@ -25,9 +25,12 @@ import kotlinx.android.synthetic.main.fragment_browser.*
 import kotlinx.android.synthetic.main.fragment_browser.view.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.MainScope
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import mozilla.components.browser.session.Session
+import mozilla.components.browser.session.SessionManager
 import mozilla.components.browser.session.intent.EXTRA_SESSION_ID
 import mozilla.components.feature.app.links.AppLinksFeature
 import mozilla.components.feature.contextmenu.ContextMenuFeature
@@ -76,8 +79,8 @@ import org.mozilla.fenix.utils.Settings
  * This class only contains shared code focused on the main browsing content.
  * UI code specific to the app or to custom tabs can be found in the subclasses.
  */
-@Suppress("TooManyFunctions")
-abstract class BaseBrowserFragment : Fragment(), BackHandler {
+@Suppress("TooManyFunctions", "LargeClass")
+abstract class BaseBrowserFragment : Fragment(), BackHandler, SessionManager.Observer {
     protected lateinit var browserStore: BrowserStore
     protected lateinit var browserInteractor: BrowserInteractor
     protected lateinit var browserToolbarView: BrowserToolbarView
@@ -95,6 +98,9 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler {
 
     var customTabSessionId: String? = null
 
+    private var browserInitialized: Boolean = false
+    private var initUIJob: Job? = null
+
     @CallSuper
     override fun onCreateView(
         inflater: LayoutInflater,
@@ -127,17 +133,19 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler {
         return view
     }
 
-    @Suppress("ComplexMethod")
     @CallSuper
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+        browserInitialized = initializeUI(view) != null
+    }
 
+    @Suppress("ComplexMethod")
+    @CallSuper
+    protected open fun initializeUI(view: View): Session? {
         val sessionManager = requireComponents.core.sessionManager
 
-        getSessionById()?.let { session ->
-            val viewModel = activity!!.run {
-                ViewModelProvider(this).get(CreateCollectionViewModel::class.java)
-            }
+        return getSessionById()?.also { session ->
+            val viewModel: CreateCollectionViewModel by activityViewModels()
 
             val browserToolbarController = DefaultBrowserToolbarController(
                 context!!,
@@ -185,157 +193,179 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler {
             browserToolbarView.view.setOnSiteSecurityClickedListener {
                 showQuickSettingsDialog()
             }
-        }
 
-        contextMenuFeature.set(
-            feature = ContextMenuFeature(
-                requireFragmentManager(),
-                sessionManager,
-                FenixContextMenuCandidate.defaultCandidates(
-                    requireContext(),
-                    requireComponents.useCases.tabsUseCases,
-                    view,
-                    FenixSnackbarDelegate(
+            contextMenuFeature.set(
+                feature = ContextMenuFeature(
+                    requireFragmentManager(),
+                    sessionManager,
+                    FenixContextMenuCandidate.defaultCandidates(
+                        requireContext(),
+                        requireComponents.useCases.tabsUseCases,
                         view,
-                        if (getSessionById()?.isCustomTabSession() == true) null else nestedScrollQuickAction
-                    )
-                ),
-                view.engineView
-            ),
-            owner = this,
-            view = view
-        )
-
-        downloadsFeature.set(
-            feature = DownloadsFeature(
-                requireContext().applicationContext,
-                sessionManager = sessionManager,
-                fragmentManager = childFragmentManager,
-                sessionId = customTabSessionId,
-                downloadManager = FetchDownloadManager(requireContext().applicationContext, DownloadService::class),
-                onNeedToRequestPermissions = { permissions ->
-                    requestPermissions(permissions, REQUEST_CODE_DOWNLOAD_PERMISSIONS)
-                }),
-            owner = this,
-            view = view
-        )
-
-        appLinksFeature.set(
-            feature = AppLinksFeature(
-                requireContext(),
-                sessionManager = sessionManager,
-                sessionId = customTabSessionId,
-                interceptLinkClicks = true,
-                fragmentManager = requireFragmentManager()
-            ),
-            owner = this,
-            view = view
-        )
-
-        promptsFeature.set(
-            feature = PromptFeature(
-                fragment = this,
-                sessionManager = sessionManager,
-                sessionId = customTabSessionId,
-                fragmentManager = requireFragmentManager(),
-                onNeedToRequestPermissions = { permissions ->
-                    requestPermissions(permissions, REQUEST_CODE_PROMPT_PERMISSIONS)
-                }),
-            owner = this,
-            view = view
-        )
-
-        sessionFeature.set(
-            feature = SessionFeature(
-                sessionManager,
-                SessionUseCases(sessionManager),
-                view.engineView,
-                customTabSessionId
-            ),
-            owner = this,
-            view = view
-        )
-
-        val accentHighContrastColor = ThemeManager.resolveAttribute(R.attr.accentHighContrast, requireContext())
-
-        sitePermissionsFeature.set(
-            feature = SitePermissionsFeature(
-                context = requireContext(),
-                sessionManager = sessionManager,
-                fragmentManager = requireFragmentManager(),
-                promptsStyling = SitePermissionsFeature.PromptsStyling(
-                    gravity = getAppropriateLayoutGravity(),
-                    shouldWidthMatchParent = true,
-                    positiveButtonBackgroundColor = accentHighContrastColor,
-                    positiveButtonTextColor = R.color.photonWhite
-                ),
-                sessionId = customTabSessionId
-            ) { permissions ->
-                requestPermissions(permissions, REQUEST_CODE_APP_PERMISSIONS)
-            },
-            owner = this,
-            view = view
-        )
-
-        fullScreenFeature.set(
-            feature = FullScreenFeature(
-                sessionManager,
-                SessionUseCases(sessionManager),
-                customTabSessionId
-            ) { inFullScreen ->
-                if (inFullScreen) {
-                    FenixSnackbar.make(view.rootView, Snackbar.LENGTH_SHORT)
-                        .setText(getString(R.string.full_screen_notification))
-                        .show()
-                    activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE
-                    activity?.enterToImmersiveMode()
-                    toolbar.visibility = View.GONE
-                    nestedScrollQuickAction.visibility = View.GONE
-                } else {
-                    activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER
-                    activity?.exitImmersiveModeIfNeeded()
-                    (activity as HomeActivity).let { activity: HomeActivity ->
-                        ThemeManager.applyStatusBarTheme(
-                            activity.window,
-                            activity.themeManager,
-                            activity
+                        FenixSnackbarDelegate(
+                            view,
+                            if (getSessionById()?.isCustomTabSession() == true) null else nestedScrollQuickAction
                         )
-                    }
-                    toolbar.visibility = View.VISIBLE
-                    nestedScrollQuickAction.visibility = View.VISIBLE
-                }
-                view.swipeRefresh.apply {
-                    val (topMargin, bottomMargin) = if (inFullScreen) 0 to 0 else getEngineMargins()
-                    (layoutParams as CoordinatorLayout.LayoutParams).setMargins(0, topMargin, 0, bottomMargin)
-                }
-            },
-            owner = this,
-            view = view
-        )
+                    ),
+                    view.engineView
+                ),
+                owner = this,
+                view = view
+            )
 
-        if (FeatureFlags.pullToRefreshEnabled) {
-            val primaryTextColor = ThemeManager.resolveAttribute(R.attr.primaryText, requireContext())
-            view.swipeRefresh.setColorSchemeColors(primaryTextColor)
-            swipeRefreshFeature.set(
-                feature = SwipeRefreshFeature(
-                    requireComponents.core.sessionManager,
-                    requireComponents.useCases.sessionUseCases.reload,
-                    view.swipeRefresh,
+            downloadsFeature.set(
+                feature = DownloadsFeature(
+                    requireContext().applicationContext,
+                    sessionManager = sessionManager,
+                    fragmentManager = childFragmentManager,
+                    sessionId = customTabSessionId,
+                    downloadManager = FetchDownloadManager(requireContext().applicationContext, DownloadService::class),
+                    onNeedToRequestPermissions = { permissions ->
+                        requestPermissions(permissions, REQUEST_CODE_DOWNLOAD_PERMISSIONS)
+                    }),
+                owner = this,
+                view = view
+            )
+
+            appLinksFeature.set(
+                feature = AppLinksFeature(
+                    requireContext(),
+                    sessionManager = sessionManager,
+                    sessionId = customTabSessionId,
+                    interceptLinkClicks = true,
+                    fragmentManager = requireFragmentManager()
+                ),
+                owner = this,
+                view = view
+            )
+
+            promptsFeature.set(
+                feature = PromptFeature(
+                    fragment = this,
+                    sessionManager = sessionManager,
+                    sessionId = customTabSessionId,
+                    fragmentManager = requireFragmentManager(),
+                    onNeedToRequestPermissions = { permissions ->
+                        requestPermissions(permissions, REQUEST_CODE_PROMPT_PERMISSIONS)
+                    }),
+                owner = this,
+                view = view
+            )
+
+            sessionFeature.set(
+                feature = SessionFeature(
+                    sessionManager,
+                    SessionUseCases(sessionManager),
+                    view.engineView,
                     customTabSessionId
                 ),
                 owner = this,
                 view = view
             )
-        } else {
-            // Disable pull to refresh
-            view.swipeRefresh.setOnChildScrollUpCallback { _, _ -> true }
+
+            val accentHighContrastColor = ThemeManager.resolveAttribute(R.attr.accentHighContrast, requireContext())
+
+            sitePermissionsFeature.set(
+                feature = SitePermissionsFeature(
+                    context = requireContext(),
+                    sessionManager = sessionManager,
+                    fragmentManager = requireFragmentManager(),
+                    promptsStyling = SitePermissionsFeature.PromptsStyling(
+                        gravity = getAppropriateLayoutGravity(),
+                        shouldWidthMatchParent = true,
+                        positiveButtonBackgroundColor = accentHighContrastColor,
+                        positiveButtonTextColor = R.color.photonWhite
+                    ),
+                    sessionId = customTabSessionId
+                ) { permissions ->
+                    requestPermissions(permissions, REQUEST_CODE_APP_PERMISSIONS)
+                },
+                owner = this,
+                view = view
+            )
+
+            fullScreenFeature.set(
+                feature = FullScreenFeature(
+                    sessionManager,
+                    SessionUseCases(sessionManager),
+                    customTabSessionId
+                ) { inFullScreen ->
+                    if (inFullScreen) {
+                        FenixSnackbar.make(view.rootView, Snackbar.LENGTH_SHORT)
+                            .setText(getString(R.string.full_screen_notification))
+                            .show()
+                        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER_LANDSCAPE
+                        activity?.enterToImmersiveMode()
+                        toolbar.visibility = View.GONE
+                        nestedScrollQuickAction.visibility = View.GONE
+                    } else {
+                        activity?.requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_USER
+                        activity?.exitImmersiveModeIfNeeded()
+                        (activity as HomeActivity).let { activity: HomeActivity ->
+                            ThemeManager.applyStatusBarTheme(
+                                activity.window,
+                                activity.themeManager,
+                                activity
+                            )
+                        }
+                        toolbar.visibility = View.VISIBLE
+                        nestedScrollQuickAction.visibility = View.VISIBLE
+                    }
+                    view.swipeRefresh.apply {
+                        val (topMargin, bottomMargin) = if (inFullScreen) 0 to 0 else getEngineMargins()
+                        (layoutParams as CoordinatorLayout.LayoutParams).setMargins(0, topMargin, 0, bottomMargin)
+                    }
+                },
+                owner = this,
+                view = view
+            )
+
+            @Suppress("ConstantConditionIf")
+            if (FeatureFlags.pullToRefreshEnabled) {
+                val primaryTextColor = ThemeManager.resolveAttribute(R.attr.primaryText, requireContext())
+                view.swipeRefresh.setColorSchemeColors(primaryTextColor)
+                swipeRefreshFeature.set(
+                    feature = SwipeRefreshFeature(
+                        requireComponents.core.sessionManager,
+                        requireComponents.useCases.sessionUseCases.reload,
+                        view.swipeRefresh,
+                        customTabSessionId
+                    ),
+                    owner = this,
+                    view = view
+                )
+            } else {
+                // Disable pull to refresh
+                view.swipeRefresh.setOnChildScrollUpCallback { _, _ -> true }
+            }
+
+            (activity as HomeActivity).updateThemeForSession(session)
         }
     }
 
+    @CallSuper
+    override fun onSessionSelected(session: Session) {
+        super.onSessionSelected(session)
+        if (!browserInitialized) {
+            // Initializing a new coroutineScope to avoid ConcurrentModificationException in ObserverRegistry
+            // This will be removed when ObserverRegistry is deprecated by browser-state.
+            initUIJob = MainScope().launch {
+                view?.let {
+                    browserInitialized = initializeUI(it) != null
+                }
+            }
+        }
+    }
+
+    @CallSuper
+    override fun onStart() {
+        super.onStart()
+        requireComponents.core.sessionManager.register(this, this, autoPause = true)
+    }
+
     @CallSuper
     override fun onResume() {
         super.onResume()
-        val session = getSessionById() ?: return
         val components = requireComponents
 
         val preferredColorScheme = components.core.getPreferredColorScheme()
@@ -343,20 +373,23 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler {
             components.core.engine.settings.preferredColorScheme = preferredColorScheme
             components.useCases.sessionUseCases.reload()
         }
-        (activity as HomeActivity).updateThemeForSession(session)
         (activity as AppCompatActivity).supportActionBar?.hide()
 
         assignSitePermissionsRules()
     }
 
-    /**
-     * Exits full screen mode.
-     */
+    @CallSuper
     final override fun onPause() {
         super.onPause()
         fullScreenFeature.onBackPressed()
     }
 
+    @CallSuper
+    override fun onStop() {
+        super.onStop()
+        initUIJob?.cancel()
+    }
+
     @CallSuper
     override fun onBackPressed(): Boolean {
         return findInPageIntegration.onBackPressed() ||
@@ -480,8 +513,9 @@ abstract class BaseBrowserFragment : Fragment(), BackHandler {
      */
     protected fun getSessionById(): Session? {
         val sessionManager = context?.components?.core?.sessionManager ?: return null
-        return if (customTabSessionId != null) {
-            sessionManager.findSessionById(customTabSessionId!!)
+        val localCustomTabId = customTabSessionId
+        return if (localCustomTabId != null) {
+            sessionManager.findSessionById(localCustomTabId)
         } else {
             sessionManager.selectedSession
         }

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -14,7 +14,6 @@ import android.widget.RadioButton
 import androidx.core.content.ContextCompat
 import androidx.lifecycle.Observer
 import androidx.lifecycle.lifecycleScope
-import androidx.navigation.fragment.NavHostFragment.findNavController
 import androidx.navigation.fragment.findNavController
 import androidx.transition.TransitionInflater
 import com.google.android.material.snackbar.Snackbar
@@ -30,7 +29,6 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
 import mozilla.appservices.places.BookmarkRoot
 import mozilla.components.browser.session.Session
-import mozilla.components.browser.session.SessionManager
 import mozilla.components.feature.readerview.ReaderViewFeature
 import mozilla.components.feature.session.ThumbnailsFeature
 import mozilla.components.lib.state.ext.consumeFrom
@@ -59,6 +57,8 @@ import java.net.URL
 /**
  * Fragment used for browsing the web within the main app and external apps.
  */
+@ObsoleteCoroutinesApi
+@ExperimentalCoroutinesApi
 @Suppress("TooManyFunctions")
 class BrowserFragment : BaseBrowserFragment(), BackHandler {
     private lateinit var quickActionSheetView: QuickActionSheetView
@@ -91,17 +91,12 @@ class BrowserFragment : BaseBrowserFragment(), BackHandler {
         return view
     }
 
-    @Suppress("LongMethod", "ComplexMethod")
-    @ObsoleteCoroutinesApi
-    @ExperimentalCoroutinesApi
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-
+    override fun initializeUI(view: View): Session? {
         val sessionManager = requireComponents.core.sessionManager
 
-        getSessionById()?.let {
-            quickActionSheetView =
-                QuickActionSheetView(view.nestedScrollQuickAction, browserInteractor)
+        return super.initializeUI(view)?.also { session ->
+
+            quickActionSheetView = QuickActionSheetView(view.nestedScrollQuickAction, browserInteractor)
 
             customTabSessionId?.let { customTabSessionId ->
                 customTabsIntegration.set(
@@ -119,57 +114,58 @@ class BrowserFragment : BaseBrowserFragment(), BackHandler {
                     view = view)
             }
 
+            thumbnailsFeature.set(
+                feature = ThumbnailsFeature(
+                    requireContext(),
+                    view.engineView,
+                    requireComponents.core.sessionManager
+                ),
+                owner = this,
+                view = view
+            )
+
+            readerViewFeature.set(
+                feature = ReaderViewFeature(
+                    requireContext(),
+                    requireComponents.core.engine,
+                    requireComponents.core.sessionManager,
+                    view.readerViewControlsBar
+                ) { available ->
+                    if (available) {
+                        requireComponents.analytics.metrics.track(Event.ReaderModeAvailable)
+                    }
+
+                    browserStore.apply {
+                        dispatch(QuickActionSheetAction.ReadableStateChange(available))
+                        dispatch(
+                            QuickActionSheetAction.ReaderActiveStateChange(
+                                sessionManager.selectedSession?.readerMode ?: false
+                            )
+                        )
+                    }
+                },
+                owner = this,
+                view = view
+            )
+
+            if ((activity as HomeActivity).browsingModeManager.isPrivate) {
+                // We need to update styles for private mode programmatically for now:
+                // https://github.com/mozilla-mobile/android-components/issues/3400
+                themeReaderViewControlsForPrivateMode(view.readerViewControlsBar)
+            }
+
+            updateBookmarkState(session)
+
             consumeFrom(browserStore) {
                 quickActionSheetView.update(it)
                 browserToolbarView.update(it)
             }
         }
-
-        thumbnailsFeature.set(
-            feature = ThumbnailsFeature(
-                requireContext(),
-                view.engineView,
-                requireComponents.core.sessionManager
-            ),
-            owner = this,
-            view = view
-        )
-
-        readerViewFeature.set(
-            feature = ReaderViewFeature(
-                requireContext(),
-                requireComponents.core.engine,
-                requireComponents.core.sessionManager,
-                view.readerViewControlsBar
-            ) { available ->
-                if (available) {
-                    requireComponents.analytics.metrics.track(Event.ReaderModeAvailable)
-                }
-
-                browserStore.apply {
-                    dispatch(QuickActionSheetAction.ReadableStateChange(available))
-                    dispatch(
-                        QuickActionSheetAction.ReaderActiveStateChange(
-                            sessionManager.selectedSession?.readerMode ?: false
-                        )
-                    )
-                }
-            },
-            owner = this,
-            view = view
-        )
-
-        if ((activity as HomeActivity).browsingModeManager.isPrivate) {
-            // We need to update styles for private mode programmatically for now:
-            // https://github.com/mozilla-mobile/android-components/issues/3400
-            themeReaderViewControlsForPrivateMode(view.readerViewControlsBar)
-        }
     }
 
     override fun onStart() {
         super.onStart()
         subscribeToSession()
-        subscribeToSessions()
         subscribeToTabCollections()
     }
 
@@ -177,11 +173,6 @@ class BrowserFragment : BaseBrowserFragment(), BackHandler {
         super.onResume()
 
         requireComponents.core.tabCollectionStorage.register(collectionStorageObserver, this)
-
-        getSessionById()?.let { updateBookmarkState(it) }
-
-        // See #4387 for why we're popping here
-        if (getSessionById() == null) findNavController(this).popBackStack(R.id.homeFragment, false)
     }
 
     override fun onBackPressed(): Boolean {
@@ -332,14 +323,9 @@ class BrowserFragment : BaseBrowserFragment(), BackHandler {
         getSessionById()?.register(observer, this, autoPause = true)
     }
 
-    private fun subscribeToSessions() {
-        val observer = object : SessionManager.Observer {
-            override fun onSessionSelected(session: Session) {
-                (activity as HomeActivity).updateThemeForSession(session)
-                updateBookmarkState(session)
-            }
-        }
-        requireComponents.core.sessionManager.register(observer, this, autoPause = true)
+    override fun onSessionSelected(session: Session) {
+        super.onSessionSelected(session)
+        updateBookmarkState(session)
     }
 
     private suspend fun findBookmarkedURL(session: Session?): Boolean {

app/src/main/java/org/mozilla/fenix/collections/CreateCollectionFragment.kt

@@ -10,7 +10,7 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.fragment.app.DialogFragment
-import androidx.lifecycle.ViewModelProvider
+import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.lifecycleScope
 import kotlinx.android.synthetic.main.fragment_create_collection.view.*
 import kotlinx.coroutines.Dispatchers
@@ -28,7 +28,7 @@ import org.mozilla.fenix.mvi.getManagedEmitter
 
 class CreateCollectionFragment : DialogFragment() {
     private lateinit var collectionCreationComponent: CollectionCreationComponent
-    private lateinit var viewModel: CreateCollectionViewModel
+    private val viewModel: CreateCollectionViewModel by activityViewModels()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -43,10 +43,6 @@ class CreateCollectionFragment : DialogFragment() {
     ): View? {
         val view = inflater.inflate(R.layout.fragment_create_collection, container, false)
 
-        viewModel = activity!!.run {
-            ViewModelProvider(this).get(CreateCollectionViewModel::class.java)
-        }
-
         collectionCreationComponent = CollectionCreationComponent(
             view.createCollectionWrapper,
             ActionBusFactory.get(this),

app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt

@@ -10,6 +10,8 @@ import android.content.Intent
 import androidx.core.widget.NestedScrollView
 import androidx.navigation.NavController
 import com.google.android.material.bottomsheet.BottomSheetBehavior
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.ObsoleteCoroutinesApi
 import mozilla.components.browser.session.Session
 import mozilla.components.concept.engine.EngineView
 import org.mozilla.fenix.BrowsingModeManager
@@ -59,6 +61,8 @@ class DefaultBrowserToolbarController(
         )
     }
 
+    @ExperimentalCoroutinesApi
+    @ObsoleteCoroutinesApi
     @SuppressWarnings("ComplexMethod")
     override fun handleToolbarItemInteraction(item: ToolbarMenu.Item) {
         val sessionUseCases = context.components.useCases.sessionUseCases

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -19,11 +19,11 @@ import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.constraintlayout.widget.ConstraintLayout.LayoutParams.PARENT_ID
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleObserver
 import androidx.lifecycle.Observer
 import androidx.lifecycle.OnLifecycleEvent
-import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.FragmentNavigator
 import androidx.navigation.fragment.NavHostFragment.findNavController
@@ -204,15 +204,12 @@ class HomeFragment : Fragment(), AccountObserver {
     }
 
     private fun restoreLayoutState() {
-        val homeViewModel = activity?.run {
-            ViewModelProvider(this).get(HomeScreenViewModel::class.java)
-        }
-
-        homeViewModel?.layoutManagerState?.also { parcelable ->
+        val homeViewModel: HomeScreenViewModel by activityViewModels()
+        homeViewModel.layoutManagerState?.also { parcelable ->
             sessionControlComponent.view.layoutManager?.onRestoreInstanceState(parcelable)
         }
-        homeLayout?.progress = homeViewModel?.motionLayoutProgress ?: 0F
-        homeViewModel?.layoutManagerState = null
+        homeLayout?.progress = homeViewModel.motionLayoutProgress
+        homeViewModel.layoutManagerState = null
     }
 
     @SuppressWarnings("LongMethod")
@@ -555,12 +552,10 @@ class HomeFragment : Fragment(), AccountObserver {
     override fun onPause() {
         invokePendingDeleteJobs()
         super.onPause()
-        val homeViewModel = activity?.run {
-            ViewModelProvider(this).get(HomeScreenViewModel::class.java)
-        }
-        homeViewModel?.layoutManagerState =
+        val homeViewModel: HomeScreenViewModel by activityViewModels()
+        homeViewModel.layoutManagerState =
             sessionControlComponent.view.layoutManager?.onSaveInstanceState()
-        homeViewModel?.motionLayoutProgress = homeLayout?.progress ?: 0F
+        homeViewModel.motionLayoutProgress = homeLayout?.progress ?: 0F
     }
 
     private fun setupHomeMenu() {
@@ -691,21 +686,18 @@ class HomeFragment : Fragment(), AccountObserver {
 
         val tabs = getListOfSessions().toTabs()
 
-        val viewModel = activity?.run {
-            ViewModelProvider(this).get(CreateCollectionViewModel::class.java)
-        }
-        viewModel?.tabs = tabs
+        val viewModel: CreateCollectionViewModel by activityViewModels()
+        viewModel.tabs = tabs
         val selectedTabs =
             tabs.find { tab -> tab.sessionId == selectedTabId }
                 ?: if (tabs.size == 1) tabs[0] else null
         val selectedSet = if (selectedTabs == null) mutableSetOf() else mutableSetOf(selectedTabs)
-        viewModel?.selectedTabs = selectedSet
-        viewModel?.tabCollections =
-            requireComponents.core.tabCollectionStorage.cachedTabCollections.reversed()
-        viewModel?.selectedTabCollection = selectedTabCollection
-        viewModel?.saveCollectionStep =
-            step ?: viewModel?.getStepForTabsAndCollectionSize() ?: SaveCollectionStep.SelectTabs
-        viewModel?.previousFragmentId = R.id.homeFragment
+        viewModel.selectedTabs = selectedSet
+        viewModel.tabCollections = requireComponents.core.tabCollectionStorage.cachedTabCollections.reversed()
+        viewModel.selectedTabCollection = selectedTabCollection
+        viewModel.saveCollectionStep =
+            step ?: viewModel.getStepForTabsAndCollectionSize()
+        viewModel.previousFragmentId = R.id.homeFragment
 
         // Only register the observer right before moving to collection creation
         requireComponents.core.tabCollectionStorage.register(collectionStorageObserver, this)

app/src/main/java/org/mozilla/fenix/settings/DeleteBrowsingDataFragment.kt

@@ -14,6 +14,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.fragment.app.Fragment
 import androidx.lifecycle.Observer
 import androidx.lifecycle.lifecycleScope
+import androidx.navigation.fragment.findNavController
 import kotlinx.android.synthetic.main.fragment_delete_browsing_data.*
 import kotlinx.android.synthetic.main.fragment_delete_browsing_data.view.*
 import kotlinx.coroutines.Dispatchers
@@ -114,14 +115,15 @@ class DeleteBrowsingDataFragment : Fragment() {
         }
     }
 
-    fun startDeletion() {
+    private fun startDeletion() {
         progress_bar.visibility = View.VISIBLE
         delete_browsing_data_wrapper.isEnabled = false
         delete_browsing_data_wrapper.isClickable = false
         delete_browsing_data_wrapper.alpha = DISABLED_ALPHA
     }
 
-    fun finishDeletion() {
+    private fun finishDeletion() {
+        val popAfter = open_tabs_item.isChecked
         progress_bar.visibility = View.GONE
         delete_browsing_data_wrapper.isEnabled = true
         delete_browsing_data_wrapper.isClickable = true
@@ -138,6 +140,10 @@ class DeleteBrowsingDataFragment : Fragment() {
         FenixSnackbar.make(view!!, FenixSnackbar.LENGTH_SHORT)
             .setText(resources.getString(R.string.preferences_delete_browsing_data_snackbar))
             .show()
+
+        if (popAfter) viewLifecycleOwner.lifecycleScope.launch(Dispatchers.Main) {
+            findNavController().popBackStack(R.id.homeFragment, false)
+        }
     }
 
     private fun updateDeleteButton() {

app/src/main/java/org/mozilla/fenix/settings/quicksettings/QuickSettingsSheetDialogFragment.kt

@@ -26,6 +26,8 @@ import androidx.navigation.fragment.NavHostFragment.findNavController
 import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.bottomsheet.BottomSheetDialog
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.ObsoleteCoroutinesApi
 import kotlinx.coroutines.launch
 import mozilla.components.browser.session.Session
 import mozilla.components.feature.sitepermissions.SitePermissions
@@ -48,6 +50,7 @@ import com.google.android.material.R as MaterialR
 
 private const val REQUEST_CODE_QUICK_SETTINGS_PERMISSIONS = 4
 
+@ObsoleteCoroutinesApi
 @SuppressWarnings("TooManyFunctions")
 class QuickSettingsSheetDialogFragment : AppCompatDialogFragment() {
     private val safeArguments get() = requireNotNull(arguments)
@@ -167,6 +170,8 @@ class QuickSettingsSheetDialogFragment : AppCompatDialogFragment() {
         }
     }
 
+    @ExperimentalCoroutinesApi
+    @ObsoleteCoroutinesApi
     override fun onResume() {
         super.onResume()
         getAutoDisposeObservable<QuickSettingsAction>()