diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index fde22eb..b7c5793 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -72,7 +72,7 @@
             android:stateNotNeeded="true"
             android:windowSoftInputMode="adjustPan"
             android:screenOrientation="unspecified"
-            android:configChanges="keyboard|keyboardHidden|navigation"
+            android:configChanges="keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenSize|screenLayout|smallestScreenSize"
             android:resizeableActivity="true"
             android:resumeWhilePausing="true"
             android:taskAffinity=""
diff --git a/protos/launcher_log.proto b/protos/launcher_log.proto
index 065663d..cab20a3 100644
--- a/protos/launcher_log.proto
+++ b/protos/launcher_log.proto
@@ -155,6 +155,7 @@
     CONFIRM = 4;        // Indicates thata confirmation screen was accepted
     STOP = 5;           // Indicates onStop() was called (screen time out, power off)
     RECENTS_BUTTON = 6; // Indicates that Recents button was pressed
+    RESUME = 7;         // Indicates onResume() was called
   }
 
   optional Type type = 1;
diff --git a/quickstep/AndroidManifest.xml b/quickstep/AndroidManifest.xml
index ac38906..778866d 100644
--- a/quickstep/AndroidManifest.xml
+++ b/quickstep/AndroidManifest.xml
@@ -54,7 +54,7 @@
             android:stateNotNeeded="true"
             android:theme="@style/LauncherTheme"
             android:screenOrientation="unspecified"
-            android:configChanges="keyboard|keyboardHidden|navigation|orientation|screenSize|screenLayout|smallestScreenSize"
+            android:configChanges="keyboard|keyboardHidden|mcc|mnc|navigation|orientation|screenSize|screenLayout|smallestScreenSize"
             android:resizeableActivity="true"
             android:resumeWhilePausing="true"
             android:taskAffinity="" />
diff --git a/quickstep/libs/sysui_shared.jar b/quickstep/libs/sysui_shared.jar
index 5e25fd8..53a6ceb 100644
--- a/quickstep/libs/sysui_shared.jar
+++ b/quickstep/libs/sysui_shared.jar
Binary files differ
diff --git a/quickstep/res/layout/overview_clear_all_button.xml b/quickstep/res/layout/overview_clear_all_button.xml
index 9c4b618..25615e0 100644
--- a/quickstep/res/layout/overview_clear_all_button.xml
+++ b/quickstep/res/layout/overview_clear_all_button.xml
@@ -11,4 +11,5 @@
     android:textColor="?attr/workspaceTextColor"
     android:visibility="invisible"
     android:textSize="14sp"
+    android:importantForAccessibility="no"
 />
\ No newline at end of file
diff --git a/quickstep/res/layout/task.xml b/quickstep/res/layout/task.xml
index 429f3a2..f163872 100644
--- a/quickstep/res/layout/task.xml
+++ b/quickstep/res/layout/task.xml
@@ -13,9 +13,11 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-<com.android.quickstep.views.TaskView xmlns:android="http://schemas.android.com/apk/res/android"
+<com.android.quickstep.views.TaskView
+    xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:focusable="false"
     android:elevation="4dp">
 
     <com.android.quickstep.views.TaskThumbnailView
@@ -29,5 +31,6 @@
         android:layout_width="@dimen/task_thumbnail_icon_size"
         android:layout_height="@dimen/task_thumbnail_icon_size"
         android:importantForAccessibility="no"
+        android:focusable="false"
         android:layout_gravity="top|center_horizontal" />
 </com.android.quickstep.views.TaskView>
\ No newline at end of file
diff --git a/quickstep/src/com/android/launcher3/LauncherAppTransitionManagerImpl.java b/quickstep/src/com/android/launcher3/LauncherAppTransitionManagerImpl.java
index 80ee577..2e31ef2 100644
--- a/quickstep/src/com/android/launcher3/LauncherAppTransitionManagerImpl.java
+++ b/quickstep/src/com/android/launcher3/LauncherAppTransitionManagerImpl.java
@@ -127,13 +127,6 @@
 
     private RemoteAnimationProvider mRemoteAnimationProvider;
 
-    private final AnimatorListenerAdapter mReapplyStateListener = new AnimatorListenerAdapter() {
-        @Override
-        public void onAnimationEnd(Animator animation) {
-            mLauncher.getStateManager().reapplyState();
-        }
-    };
-
     private final AnimatorListenerAdapter mForceInvisibleListener = new AnimatorListenerAdapter() {
         @Override
         public void onAnimationStart(Animator animation) {
@@ -260,7 +253,13 @@
             launcherAnim.setDuration(RECENTS_LAUNCH_DURATION);
 
             // Make sure recents gets fixed up by resetting task alphas and scales, etc.
-            windowAnimEndListener = mReapplyStateListener;
+            windowAnimEndListener = new AnimatorListenerAdapter() {
+                @Override
+                public void onAnimationEnd(Animator animation) {
+                    mLauncher.getStateManager().moveToRestState();
+                    mLauncher.getStateManager().reapplyState();
+                }
+            };
         } else {
             AnimatorPlaybackController controller =
                     mLauncher.getStateManager()
diff --git a/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java b/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java
new file mode 100644
index 0000000..2e6dcc0
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/BackButtonAlphaHandler.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * 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 com.android.launcher3.uioverrides;
+
+import android.animation.ValueAnimator;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherState;
+import com.android.launcher3.LauncherStateManager;
+import com.android.launcher3.anim.AnimatorSetBuilder;
+import com.android.quickstep.OverviewInteractionState;
+
+public class BackButtonAlphaHandler implements LauncherStateManager.StateHandler {
+
+    private static final String TAG = "BackButtonAlphaHandler";
+
+    private final Launcher mLauncher;
+    private final OverviewInteractionState mOverviewInteractionState;
+
+    public BackButtonAlphaHandler(Launcher launcher) {
+        mLauncher = launcher;
+        mOverviewInteractionState = OverviewInteractionState.getInstance(mLauncher);
+    }
+
+    @Override
+    public void setState(LauncherState state) {
+        UiFactory.onLauncherStateOrFocusChanged(mLauncher);
+    }
+
+    @Override
+    public void setStateWithAnimation(LauncherState toState,
+            AnimatorSetBuilder builder, LauncherStateManager.AnimationConfig config) {
+        if (!config.playNonAtomicComponent()) {
+            return;
+        }
+        float fromAlpha = mOverviewInteractionState.getBackButtonAlpha();
+        float toAlpha = toState.hideBackButton ? 0 : 1;
+        if (Float.compare(fromAlpha, toAlpha) != 0) {
+            ValueAnimator anim = ValueAnimator.ofFloat(fromAlpha, toAlpha);
+            anim.setDuration(config.duration);
+            anim.addUpdateListener(valueAnimator -> {
+                final float alpha = (float) valueAnimator.getAnimatedValue();
+                mOverviewInteractionState.setBackButtonAlpha(alpha, false);
+            });
+            builder.play(anim);
+        }
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java b/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
index 54ecb28..987f952 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/PortraitStatesTouchController.java
@@ -189,14 +189,8 @@
             if (isFling && expectedDuration != 0) {
                 // Update all apps interpolator to add a bit of overshoot starting from currFraction
                 final float currFraction = mCurrentAnimation.getProgressFraction();
-                mAllAppsInterpolatorWrapper.baseInterpolator
-                        = new OvershootInterpolator(Math.min(Math.abs(velocity) / 3, 3f)) {
-                    @Override
-                    public float getInterpolation(float t) {
-                        return super.getInterpolation(t) + ((1 - t) * currFraction);
-                    }
-                };
-                animator.setFloatValues(0, 1);
+                mAllAppsInterpolatorWrapper.baseInterpolator = Interpolators.clampToProgress(
+                        new OvershootInterpolator(Math.min(Math.abs(velocity), 3f)), currFraction, 1);
                 animator.setDuration(Math.min(expectedDuration, ATOMIC_DURATION))
                         .setInterpolator(LINEAR);
             }
diff --git a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
index 3e80d2c..76820b6 100644
--- a/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
+++ b/quickstep/src/com/android/launcher3/uioverrides/UiFactory.java
@@ -78,11 +78,13 @@
     }
 
     public static StateHandler[] getStateHandler(Launcher launcher) {
-        return new StateHandler[] {
-                launcher.getAllAppsController(), launcher.getWorkspace(),
-                new RecentsViewStateController(launcher)};
+        return new StateHandler[] {launcher.getAllAppsController(), launcher.getWorkspace(),
+                new RecentsViewStateController(launcher), new BackButtonAlphaHandler(launcher)};
     }
 
+    /**
+     * Sets the back button visibility based on the current state/window focus.
+     */
     public static void onLauncherStateOrFocusChanged(Launcher launcher) {
         boolean shouldBackButtonBeHidden = launcher != null
                 && launcher.getStateManager().getState().hideBackButton
@@ -93,7 +95,7 @@
                     TYPE_ALL & ~TYPE_HIDE_BACK_BUTTON) == null;
         }
         OverviewInteractionState.getInstance(launcher)
-                .setBackButtonVisible(!shouldBackButtonBeHidden);
+                .setBackButtonAlpha(shouldBackButtonBeHidden ? 0 : 1, true /* animate */);
     }
 
     public static void resetOverview(Launcher launcher) {
diff --git a/quickstep/src/com/android/quickstep/MotionEventQueue.java b/quickstep/src/com/android/quickstep/MotionEventQueue.java
index 538e23c..15f5aa5 100644
--- a/quickstep/src/com/android/quickstep/MotionEventQueue.java
+++ b/quickstep/src/com/android/quickstep/MotionEventQueue.java
@@ -163,7 +163,7 @@
                             mConsumer.updateTouchTracking(INTERACTION_QUICK_SCRUB);
                             break;
                         case ACTION_QUICK_STEP:
-                            mConsumer.onQuickStep(event.getX(), event.getY(), event.getEventTime());
+                            mConsumer.onQuickStep(event);
                             break;
                         default:
                             Log.e(TAG, "Invalid virtual event: " + event.getAction());
diff --git a/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java b/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java
index 2d41a5b..23738fb 100644
--- a/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java
+++ b/quickstep/src/com/android/quickstep/OtherActivityTouchConsumer.java
@@ -82,6 +82,7 @@
     private final PointF mLastPos = new PointF();
     private int mActivePointerId = INVALID_POINTER_ID;
     private boolean mPassedInitialSlop;
+    // Used for non-deferred gestures to determine when to start dragging
     private int mQuickStepDragSlop;
     private float mStartDisplacement;
     private WindowTransformSwipeHandler mInteractionHandler;
@@ -160,15 +161,14 @@
                 }
                 mLastPos.set(ev.getX(pointerIndex), ev.getY(pointerIndex));
                 float displacement = getDisplacement(ev);
-                if (!mPassedInitialSlop
-                        && Math.abs(displacement) > mQuickStepDragSlop) {
-                    mPassedInitialSlop = true;
-                    mStartDisplacement = displacement;
-
-                    // If we deferred starting the window animation on touch down, then
-                    // start tracking now
-                    if (mIsDeferredDownTarget) {
-                        startTouchTrackingForWindowAnimation(ev.getEventTime());
+                if (!mPassedInitialSlop) {
+                    if (!mIsDeferredDownTarget) {
+                        // Normal gesture, ensure we pass the drag slop before we start tracking
+                        // the gesture
+                        if (Math.abs(displacement) > mQuickStepDragSlop) {
+                            mPassedInitialSlop = true;
+                            mStartDisplacement = displacement;
+                        }
                     }
                 }
 
@@ -353,7 +353,14 @@
     }
 
     @Override
-    public void onQuickStep(float eventX, float eventY, long eventTime) {
+    public void onQuickStep(MotionEvent ev) {
+        if (mIsDeferredDownTarget) {
+            // Deferred gesture, start the animation and gesture tracking once we pass the actual
+            // touch slop
+            startTouchTrackingForWindowAnimation(ev.getEventTime());
+            mPassedInitialSlop = true;
+            mStartDisplacement = getDisplacement(ev);
+        }
         notifyGestureStarted();
     }
 
diff --git a/quickstep/src/com/android/quickstep/OverviewInteractionState.java b/quickstep/src/com/android/quickstep/OverviewInteractionState.java
index 420406c..922a7ff 100644
--- a/quickstep/src/com/android/quickstep/OverviewInteractionState.java
+++ b/quickstep/src/com/android/quickstep/OverviewInteractionState.java
@@ -17,7 +17,6 @@
 
 import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_DISABLE_QUICK_SCRUB;
 import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_DISABLE_SWIPE_UP;
-import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_HIDE_BACK_BUTTON;
 import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_SHOW_OVERVIEW_BUTTON;
 import static com.android.systemui.shared.system.SettingsCompat.SWIPE_UP_SETTING_NAME;
 
@@ -46,7 +45,6 @@
  *
  *   - FLAG_DISABLE_QUICK_SCRUB
  *   - FLAG_DISABLE_SWIPE_UP
- *   - FLAG_HIDE_BACK_BUTTON
  *   - FLAG_SHOW_OVERVIEW_BUTTON
  *
  * @see com.android.systemui.shared.system.NavigationBarCompat.InteractionType and associated flags.
@@ -81,7 +79,7 @@
     }
 
     private static final int MSG_SET_PROXY = 200;
-    private static final int MSG_SET_BACK_BUTTON_VISIBLE = 201;
+    private static final int MSG_SET_BACK_BUTTON_ALPHA = 201;
     private static final int MSG_SET_SWIPE_UP_ENABLED = 202;
 
     private final SwipeUpGestureEnabledSettingObserver mSwipeUpSettingObserver;
@@ -92,13 +90,17 @@
 
     // These are updated on the background thread
     private ISystemUiProxy mISystemUiProxy;
-    private boolean mBackButtonVisible = true;
     private boolean mSwipeUpEnabled = true;
+    private float mBackButtonAlpha = 1;
 
     private Runnable mOnSwipeUpSettingChangedListener;
 
     private OverviewInteractionState(Context context) {
         mContext = context;
+
+        // Data posted to the uihandler will be sent to the bghandler. Data is sent to uihandler
+        // because of its high send frequency and data may be very different than the previous value
+        // For example, send back alpha on uihandler to avoid flickering when setting its visibility
         mUiHandler = new Handler(this::handleUiMessage);
         mBgHandler = new Handler(UiThreadHelper.getBackgroundLooper(), this::handleBgMessage);
 
@@ -116,9 +118,16 @@
         return mSwipeUpEnabled;
     }
 
-    public void setBackButtonVisible(boolean visible) {
-        mUiHandler.removeMessages(MSG_SET_BACK_BUTTON_VISIBLE);
-        mUiHandler.obtainMessage(MSG_SET_BACK_BUTTON_VISIBLE, visible ? 1 : 0, 0)
+    public float getBackButtonAlpha() {
+        return mBackButtonAlpha;
+    }
+
+    public void setBackButtonAlpha(float alpha, boolean animate) {
+        if (!mSwipeUpEnabled) {
+            alpha = 1;
+        }
+        mUiHandler.removeMessages(MSG_SET_BACK_BUTTON_ALPHA);
+        mUiHandler.obtainMessage(MSG_SET_BACK_BUTTON_ALPHA, animate ? 1 : 0, 0, alpha)
                 .sendToTarget();
     }
 
@@ -127,7 +136,10 @@
     }
 
     private boolean handleUiMessage(Message msg) {
-        mBgHandler.obtainMessage(msg.what, msg.arg1, msg.arg2).sendToTarget();
+        if (msg.what == MSG_SET_BACK_BUTTON_ALPHA) {
+            mBackButtonAlpha = (float) msg.obj;
+        }
+        mBgHandler.obtainMessage(msg.what, msg.arg1, msg.arg2, msg.obj).sendToTarget();
         return true;
     }
 
@@ -136,9 +148,9 @@
             case MSG_SET_PROXY:
                 mISystemUiProxy = (ISystemUiProxy) msg.obj;
                 break;
-            case MSG_SET_BACK_BUTTON_VISIBLE:
-                mBackButtonVisible = msg.arg1 != 0;
-                break;
+            case MSG_SET_BACK_BUTTON_ALPHA:
+                applyBackButtonAlpha((float) msg.obj, msg.arg1 == 1);
+                return true;
             case MSG_SET_SWIPE_UP_ENABLED:
                 mSwipeUpEnabled = msg.arg1 != 0;
                 resetHomeBounceSeenOnQuickstepEnabledFirstTime();
@@ -162,10 +174,8 @@
             return;
         }
 
-        int flags;
-        if (mSwipeUpEnabled) {
-            flags = mBackButtonVisible ? 0 : FLAG_HIDE_BACK_BUTTON;
-        } else {
+        int flags = 0;
+        if (!mSwipeUpEnabled) {
             flags = FLAG_DISABLE_SWIPE_UP | FLAG_DISABLE_QUICK_SCRUB | FLAG_SHOW_OVERVIEW_BUTTON;
         }
         try {
@@ -175,6 +185,18 @@
         }
     }
 
+    @WorkerThread
+    private void applyBackButtonAlpha(float alpha, boolean animate) {
+        if (mISystemUiProxy == null) {
+            return;
+        }
+        try {
+            mISystemUiProxy.setBackButtonAlpha(alpha, animate);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to update overview back button alpha", e);
+        }
+    }
+
     private class SwipeUpGestureEnabledSettingObserver extends ContentObserver {
         private Handler mHandler;
         private ContentResolver mResolver;
diff --git a/quickstep/src/com/android/quickstep/QuickScrubController.java b/quickstep/src/com/android/quickstep/QuickScrubController.java
index 28b06fb..abb479d 100644
--- a/quickstep/src/com/android/quickstep/QuickScrubController.java
+++ b/quickstep/src/com/android/quickstep/QuickScrubController.java
@@ -63,6 +63,7 @@
     private final BaseActivity mActivity;
 
     private boolean mInQuickScrub;
+    private boolean mWaitingForTaskLaunch;
     private int mQuickScrubSection;
     private boolean mStartedFromHome;
     private boolean mFinishedTransitionToQuickScrub;
@@ -79,11 +80,11 @@
     }
 
     public void onQuickScrubStart(boolean startingFromHome, ActivityControlHelper controlHelper) {
+        prepareQuickScrub(TAG);
         mInQuickScrub = true;
         mStartedFromHome = startingFromHome;
         mQuickScrubSection = 0;
         mFinishedTransitionToQuickScrub = false;
-        mOnFinishedTransitionToQuickScrubRunnable = null;
         mActivityControlHelper = controlHelper;
 
         snapToNextTaskIfAvailable();
@@ -99,11 +100,17 @@
         Runnable launchTaskRunnable = () -> {
             TaskView taskView = mRecentsView.getPageAt(page);
             if (taskView != null) {
+                mWaitingForTaskLaunch = true;
                 taskView.launchTask(true, (result) -> {
                     if (!result) {
                         taskView.notifyTaskLaunchFailed(TAG);
                         breakOutOfQuickScrub();
+                    } else {
+                        mActivity.getUserEventDispatcher().logTaskLaunchOrDismiss(Touch.DRAGDROP,
+                                LauncherLogProto.Action.Direction.NONE, page,
+                                TaskUtils.getComponentKeyForTask(taskView.getTask().key));
                     }
+                    mWaitingForTaskLaunch = false;
                 }, taskView.getHandler());
             } else {
                 breakOutOfQuickScrub();
@@ -123,9 +130,19 @@
                 mOnFinishedTransitionToQuickScrubRunnable = launchTaskRunnable;
             }
         }
-        mActivity.getUserEventDispatcher().logTaskLaunchOrDismiss(Touch.DRAGDROP,
-                LauncherLogProto.Action.Direction.NONE, page,
-                TaskUtils.getComponentKeyForTask(mRecentsView.getPageAt(page).getTask().key));
+    }
+
+    /**
+     * Initializes the UI for quick scrub, returns true if success.
+     */
+    public boolean prepareQuickScrub(String tag) {
+        if (mWaitingForTaskLaunch || mInQuickScrub) {
+            Log.d(tag, "Waiting for last scrub to finish, will skip this interaction");
+            return false;
+        }
+        mOnFinishedTransitionToQuickScrubRunnable = null;
+        mRecentsView.setNextPageSwitchRunnable(null);
+        return true;
     }
 
     /**
@@ -166,9 +183,11 @@
 
     public void onFinishedTransitionToQuickScrub() {
         mFinishedTransitionToQuickScrub = true;
-        if (mOnFinishedTransitionToQuickScrubRunnable != null) {
-            mOnFinishedTransitionToQuickScrubRunnable.run();
-            mOnFinishedTransitionToQuickScrubRunnable = null;
+        Runnable action = mOnFinishedTransitionToQuickScrubRunnable;
+        // Clear the runnable before executing it, to prevent potential recursion.
+        mOnFinishedTransitionToQuickScrubRunnable = null;
+        if (action != null) {
+            action.run();
         }
     }
 
diff --git a/quickstep/src/com/android/quickstep/TaskUtils.java b/quickstep/src/com/android/quickstep/TaskUtils.java
index d7fad43..2b0c98f 100644
--- a/quickstep/src/com/android/quickstep/TaskUtils.java
+++ b/quickstep/src/com/android/quickstep/TaskUtils.java
@@ -98,12 +98,13 @@
         if (v.getTag() instanceof ItemInfo) {
             ItemInfo itemInfo = (ItemInfo) v.getTag();
             ComponentName componentName = itemInfo.getTargetComponent();
+            int userId = itemInfo.user.getIdentifier();
             if (componentName != null) {
                 for (int i = 0; i < recentsView.getChildCount(); i++) {
                     TaskView taskView = recentsView.getPageAt(i);
                     if (recentsView.isTaskViewVisible(taskView)) {
-                        Task task = taskView.getTask();
-                        if (componentName.equals(task.key.getComponent())) {
+                        Task.TaskKey key = taskView.getTask().key;
+                        if (componentName.equals(key.getComponent()) && userId == key.userId) {
                             return taskView;
                         }
                     }
diff --git a/quickstep/src/com/android/quickstep/TouchConsumer.java b/quickstep/src/com/android/quickstep/TouchConsumer.java
index 1290ec3..aa844d8 100644
--- a/quickstep/src/com/android/quickstep/TouchConsumer.java
+++ b/quickstep/src/com/android/quickstep/TouchConsumer.java
@@ -46,7 +46,7 @@
 
     default void onQuickScrubProgress(float progress) { }
 
-    default void onQuickStep(float eventX, float eventY, long eventTime) { }
+    default void onQuickStep(MotionEvent ev) { }
 
     /**
      * Called on the binder thread to allow the consumer to process the motion event before it is
diff --git a/quickstep/src/com/android/quickstep/TouchInteractionService.java b/quickstep/src/com/android/quickstep/TouchInteractionService.java
index bd05b6d..aecb66c 100644
--- a/quickstep/src/com/android/quickstep/TouchInteractionService.java
+++ b/quickstep/src/com/android/quickstep/TouchInteractionService.java
@@ -334,7 +334,7 @@
         }
 
         @Override
-        public void onQuickStep(float eventX, float eventY, long eventTime) {
+        public void onQuickStep(MotionEvent ev) {
             if (mInvalidated) {
                 return;
             }
@@ -349,12 +349,20 @@
                 return;
             }
             if (interactionType == INTERACTION_QUICK_SCRUB) {
+                if (!mQuickScrubController.prepareQuickScrub(TAG)) {
+                    mInvalidated = true;
+                    return;
+                }
                 OverviewCallbacks.get(mActivity).closeAllWindows();
                 ActivityManagerWrapper.getInstance()
                         .closeSystemWindows(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
 
                 mStartPending = true;
                 Runnable action = () -> {
+                    if (!mQuickScrubController.prepareQuickScrub(TAG)) {
+                        mInvalidated = true;
+                        return;
+                    }
                     mActivityHelper.onQuickInteractionStart(mActivity, null, true);
                     mQuickScrubController.onQuickScrubProgress(mLastProgress);
                     mStartPending = false;
@@ -384,7 +392,7 @@
         @Override
         public void onQuickScrubProgress(float progress) {
             mLastProgress = progress;
-            if (mInvalidated || mEndPending) {
+            if (mInvalidated || mStartPending) {
                 return;
             }
             mQuickScrubController.onQuickScrubProgress(progress);
diff --git a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
index 807dae8..84b2176 100644
--- a/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
+++ b/quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java
@@ -109,6 +109,8 @@
     private static final int STATE_CAPTURE_SCREENSHOT = 1 << 14;
     private static final int STATE_SCREENSHOT_CAPTURED = 1 << 15;
 
+    private static final int STATE_RESUME_LAST_TASK = 1 << 16;
+
     private static final int LAUNCHER_UI_STATES =
             STATE_LAUNCHER_PRESENT | STATE_LAUNCHER_DRAWN | STATE_ACTIVITY_MULTIPLIER_COMPLETE
             | STATE_LAUNCHER_STARTED;
@@ -139,6 +141,7 @@
             "STATE_QUICK_SCRUB_END",
             "STATE_CAPTURE_SCREENSHOT",
             "STATE_SCREENSHOT_CAPTURED",
+            "STATE_RESUME_LAST_TASK",
     };
 
     public static final long MAX_SWIPE_DURATION = 350;
@@ -187,6 +190,7 @@
     private boolean mGestureStarted;
     private int mLogAction = Touch.SWIPE;
     private float mCurrentQuickScrubProgress;
+    private boolean mQuickScrubBlocked;
 
     private @InteractionType int mInteractionType = INTERACTION_NORMAL;
 
@@ -239,9 +243,12 @@
 
         mStateCallback.addCallback(STATE_LAUNCHER_STARTED | STATE_APP_CONTROLLER_RECEIVED,
                 this::sendRemoteAnimationsToAnimationFactory);
-        mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_APP_CONTROLLER_RECEIVED
-                        | STATE_SCALED_CONTROLLER_APP,
+
+        mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_SCALED_CONTROLLER_APP,
+                this::resumeLastTaskForQuickstep);
+        mStateCallback.addCallback(STATE_RESUME_LAST_TASK | STATE_APP_CONTROLLER_RECEIVED,
                 this::resumeLastTask);
+
         mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_APP_CONTROLLER_RECEIVED
                         | STATE_ACTIVITY_MULTIPLIER_COMPLETE
                         | STATE_CAPTURE_SCREENSHOT,
@@ -258,9 +265,6 @@
                         | STATE_GESTURE_COMPLETED,
                 this::setupLauncherUiAfterSwipeUpAnimation);
 
-        mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_SCALED_CONTROLLER_APP,
-                this::reset);
-
         mStateCallback.addCallback(STATE_HANDLER_INVALIDATED, this::invalidateHandler);
         mStateCallback.addCallback(STATE_LAUNCHER_PRESENT | STATE_HANDLER_INVALIDATED,
                 this::invalidateHandlerWithLauncher);
@@ -657,9 +661,15 @@
     }
 
     @UiThread
+    private void resumeLastTaskForQuickstep() {
+        setStateOnUiThread(STATE_RESUME_LAST_TASK);
+        doLogGesture(false /* toLauncher */);
+        reset();
+    }
+
+    @UiThread
     private void resumeLastTask() {
         mRecentsAnimationWrapper.finish(false /* toHome */, null);
-        doLogGesture(false /* toLauncher */);
     }
 
     public void reset() {
@@ -760,6 +770,11 @@
     }
 
     private void onQuickScrubStart() {
+        if (!mQuickScrubController.prepareQuickScrub(TAG)) {
+            mQuickScrubBlocked = true;
+            setStateOnUiThread(STATE_RESUME_LAST_TASK | STATE_HANDLER_INVALIDATED);
+            return;
+        }
         if (mLauncherTransitionController != null) {
             mLauncherTransitionController.getAnimationPlayer().end();
             mLauncherTransitionController = null;
@@ -793,12 +808,16 @@
     }
 
     private void onFinishedTransitionToQuickScrub() {
+        if (mQuickScrubBlocked) {
+            return;
+        }
         mQuickScrubController.onFinishedTransitionToQuickScrub();
     }
 
     public void onQuickScrubProgress(float progress) {
         mCurrentQuickScrubProgress = progress;
-        if (Looper.myLooper() != Looper.getMainLooper() || mQuickScrubController == null) {
+        if (Looper.myLooper() != Looper.getMainLooper() || mQuickScrubController == null
+                || mQuickScrubBlocked) {
             return;
         }
         mQuickScrubController.onQuickScrubProgress(progress);
@@ -809,6 +828,9 @@
     }
 
     private void switchToFinalAppAfterQuickScrub() {
+        if (mQuickScrubBlocked) {
+            return;
+        }
         mQuickScrubController.onQuickScrubEnd();
 
         // Normally this is handled in reset(), but since we are still scrubbing after the
diff --git a/quickstep/src/com/android/quickstep/fallback/FallbackRecentsView.java b/quickstep/src/com/android/quickstep/fallback/FallbackRecentsView.java
index 9e2de33..c5d74c7 100644
--- a/quickstep/src/com/android/quickstep/fallback/FallbackRecentsView.java
+++ b/quickstep/src/com/android/quickstep/fallback/FallbackRecentsView.java
@@ -20,8 +20,10 @@
 import android.graphics.Rect;
 import android.util.AttributeSet;
 import android.view.View;
+import android.view.accessibility.AccessibilityNodeInfo;
 
 import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.R;
 import com.android.quickstep.RecentsActivity;
 import com.android.quickstep.util.LayoutUtils;
 import com.android.quickstep.views.RecentsView;
@@ -71,4 +73,21 @@
         // Just use the activity task size for multi-window as well.
         return false;
     }
+
+    @Override
+    public void addTaskAccessibilityActionsExtra(AccessibilityNodeInfo info) {
+        info.addAction(
+                new AccessibilityNodeInfo.AccessibilityAction(
+                        R.string.recents_clear_all,
+                        getContext().getText(R.string.recents_clear_all)));
+    }
+
+    @Override
+    public boolean performTaskAccessibilityActionExtra(int action) {
+        if (action == R.string.recents_clear_all) {
+            dismissAllTasks();
+            return true;
+        }
+        return false;
+    }
 }
diff --git a/quickstep/src/com/android/quickstep/views/ClearAllButton.java b/quickstep/src/com/android/quickstep/views/ClearAllButton.java
index f3a0e4f..25e3dc6 100644
--- a/quickstep/src/com/android/quickstep/views/ClearAllButton.java
+++ b/quickstep/src/com/android/quickstep/views/ClearAllButton.java
@@ -19,10 +19,10 @@
 import static android.view.accessibility.AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS;
 
 import android.content.Context;
+import android.graphics.Rect;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.util.AttributeSet;
-import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.Button;
 
 public class ClearAllButton extends Button {
@@ -37,14 +37,6 @@
     }
 
     @Override
-    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
-        super.onInitializeAccessibilityNodeInfo(info);
-        // Should be visible to accessibility even when completely covered by the task.
-        // Otherwise, we won't be able to scroll to it.
-        info.setVisibleToUser(true);
-    }
-
-    @Override
     public boolean performAccessibilityAction(int action, Bundle arguments) {
         final boolean res = super.performAccessibilityAction(action, arguments);
         if (action == ACTION_ACCESSIBILITY_FOCUS) {
@@ -52,4 +44,12 @@
         }
         return res;
     }
+
+    @Override
+    protected void onFocusChanged(boolean focused, int direction, Rect previouslyFocusedRect) {
+        super.onFocusChanged(focused, direction, previouslyFocusedRect);
+        if (focused) {
+            mRecentsView.revealClearAllButton();
+        }
+    }
 }
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 01e5cba..ae8ebbe 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -39,6 +39,9 @@
 import android.graphics.Rect;
 import android.graphics.drawable.Drawable;
 import android.os.Build;
+import android.os.Handler;
+import android.os.UserHandle;
+import android.support.annotation.Nullable;
 import android.text.Layout;
 import android.text.StaticLayout;
 import android.text.TextPaint;
@@ -51,7 +54,7 @@
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewDebug;
-import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityNodeInfo;
 
 import com.android.launcher3.BaseActivity;
 import com.android.launcher3.DeviceProfile;
@@ -78,6 +81,8 @@
 import com.android.systemui.shared.recents.model.TaskStack;
 import com.android.systemui.shared.recents.model.ThumbnailData;
 import com.android.systemui.shared.system.ActivityManagerWrapper;
+import com.android.systemui.shared.system.BackgroundExecutor;
+import com.android.systemui.shared.system.PackageManagerWrapper;
 import com.android.systemui.shared.system.TaskStackChangeListener;
 
 import java.util.ArrayList;
@@ -166,10 +171,38 @@
             if (!mHandleTaskStackChanges) {
                 return;
             }
-            TaskView taskView = getTaskView(taskId);
-            if (taskView != null) {
-                dismissTask(taskView, true /* animate */, false /* removeTask */);
-            }
+            BackgroundExecutor.get().submit(() -> {
+                TaskView taskView = getTaskView(taskId);
+                if (taskView == null) {
+                    return;
+                }
+                Handler handler = taskView.getHandler();
+                if (handler == null) {
+                    return;
+                }
+
+                // TODO: Add callbacks from AM reflecting adding/removing from the recents list, and
+                //       remove all these checks
+                Task.TaskKey taskKey = taskView.getTask().key;
+                if (PackageManagerWrapper.getInstance().getActivityInfo(taskKey.getComponent(),
+                        taskKey.userId) == null) {
+                    // The package was uninstalled
+                    handler.post(() ->
+                            dismissTask(taskView, true /* animate */, false /* removeTask */));
+                } else {
+                    RecentsTaskLoadPlan loadPlan = new RecentsTaskLoadPlan(getContext());
+                    RecentsTaskLoadPlan.PreloadOptions opts =
+                            new RecentsTaskLoadPlan.PreloadOptions();
+                    opts.loadTitles = false;
+                    loadPlan.preloadPlan(opts, mModel.getRecentsTaskLoader(), -1,
+                            UserHandle.myUserId());
+                    if (loadPlan.getTaskStack().findTaskWithId(taskId) == null) {
+                        // The task was removed from the recents list
+                        handler.post(() ->
+                                dismissTask(taskView, true /* animate */, false /* removeTask */));
+                    }
+                }
+            });
         }
 
         @Override
@@ -550,6 +583,11 @@
      * and unloads the associated task data for tasks that are no longer visible.
      */
     public void loadVisibleTaskData() {
+        if (!mOverviewStateEnabled) {
+            // Skip loading visible task data if we've already left the overview state
+            return;
+        }
+
         RecentsTaskLoader loader = mModel.getRecentsTaskLoader();
         int centerPageIndex = getPageNearestToCenterOfScreen();
         int lower = Math.max(0, centerPageIndex - 2);
@@ -936,6 +974,13 @@
         if (event.getAction() == KeyEvent.ACTION_DOWN) {
             switch (event.getKeyCode()) {
                 case KeyEvent.KEYCODE_TAB:
+                    if (!event.isAltPressed() &&
+                            getNextPage() ==
+                                    (event.isShiftPressed() ? 0 : getChildCount() - 1)) {
+                        // If not Alt-Tab navigation, don't loop forever in the carousel and leave
+                        // it once we reached the end.
+                        return false;
+                    }
                     snapToPageRelative(event.isShiftPressed() ? -1 : 1);
                     return true;
                 case KeyEvent.KEYCODE_DPAD_RIGHT:
@@ -961,6 +1006,22 @@
         return super.dispatchKeyEvent(event);
     }
 
+    @Override
+    protected void onFocusChanged(boolean gainFocus, int direction,
+            @Nullable Rect previouslyFocusedRect) {
+        super.onFocusChanged(gainFocus, direction, previouslyFocusedRect);
+        if (gainFocus && getChildCount() > 0) {
+            switch (direction) {
+                case FOCUS_FORWARD:
+                    setCurrentPage(0);
+                    break;
+                case FOCUS_BACKWARD:
+                    setCurrentPage(getChildCount() - 1);
+                    break;
+            }
+        }
+    }
+
     public void snapToTaskAfterNext() {
         snapToPageRelative(1);
     }
@@ -970,6 +1031,7 @@
     }
 
     public void setContentAlpha(float alpha) {
+        alpha = Utilities.boundToRange(alpha, 0, 1);
         mContentAlpha = alpha;
         for (int i = getChildCount() - 1; i >= 0; i--) {
             TaskView child = getPageAt(i);
@@ -1232,10 +1294,6 @@
     @Override
     protected void notifyPageSwitchListener(int prevPage) {
         super.notifyPageSwitchListener(prevPage);
-        View currChild = getChildAt(mCurrentPage);
-        if (currChild != null) {
-            currChild.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
-        }
         loadVisibleTaskData();
     }
 
@@ -1271,12 +1329,34 @@
 
     private void onChildViewsChanged() {
         final int childCount = getChildCount();
-        mClearAllButton.setAccessibilityTraversalAfter(
-                childCount == 0 ? NO_ID : getChildAt(childCount - 1).getId());
         mClearAllButton.setVisibility(childCount == 0 ? INVISIBLE : VISIBLE);
     }
 
     public void revealClearAllButton() {
+        setCurrentPage(getChildCount() - 1); // Loads tasks info if needed.
         scrollTo(mIsRtl ? 0 : computeMaxScrollX(), 0);
     }
+
+    @Override
+    public void addChildrenForAccessibility(ArrayList<View> outChildren) {
+        if (FLIP_RECENTS) {
+            for (int i = getChildCount() - 1; i >= 0; --i) {
+                outChildren.add(getChildAt(i));
+            }
+        } else {
+            super.addChildrenForAccessibility(outChildren);
+        }
+    }
+
+    @Override
+    protected boolean isPageOrderFlipped() {
+        return FLIP_RECENTS;
+    }
+
+    public void addTaskAccessibilityActionsExtra(AccessibilityNodeInfo info) {
+    }
+
+    public boolean performTaskAccessibilityActionExtra(int action) {
+        return false;
+    }
 }
diff --git a/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java b/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
index 429432b..06e2e89 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsViewContainer.java
@@ -25,10 +25,13 @@
 import android.util.FloatProperty;
 import android.view.Gravity;
 import android.view.MotionEvent;
+import android.view.View;
 
 import com.android.launcher3.InsettableFrameLayout;
 import com.android.launcher3.R;
 
+import java.util.ArrayList;
+
 public class RecentsViewContainer extends InsettableFrameLayout {
     public static final FloatProperty<RecentsViewContainer> CONTENT_ALPHA =
             new FloatProperty<RecentsViewContainer>("contentAlpha") {
@@ -104,4 +107,11 @@
         mRecentsView.setContentAlpha(alpha);
         setVisibility(alpha > 0 ? VISIBLE : GONE);
     }
+
+    @Override
+    public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
+        // Carousel is first in tab order.
+        views.add(mRecentsView);
+        views.add(mClearAllButton);
+    }
 }
\ No newline at end of file
diff --git a/quickstep/src/com/android/quickstep/views/TaskView.java b/quickstep/src/com/android/quickstep/views/TaskView.java
index 82aa45a..2f1a0fe 100644
--- a/quickstep/src/com/android/quickstep/views/TaskView.java
+++ b/quickstep/src/com/android/quickstep/views/TaskView.java
@@ -17,6 +17,7 @@
 package com.android.quickstep.views;
 
 import static android.widget.Toast.LENGTH_SHORT;
+
 import static com.android.quickstep.views.TaskThumbnailView.DIM_ALPHA_MULTIPLIER;
 
 import android.animation.Animator;
@@ -116,7 +117,7 @@
             }
             launchTask(true /* animate */);
             BaseActivity.fromContext(context).getUserEventDispatcher().logTaskLaunchOrDismiss(
-                    Touch.TAP, Direction.NONE, ((RecentsView) getParent()).indexOfChild(this),
+                    Touch.TAP, Direction.NONE, getRecentsView().indexOfChild(this),
                     TaskUtils.getComponentKeyForTask(getTask().key));
         });
         setOutlineProvider(new TaskOutlineProvider(getResources()));
@@ -318,12 +319,14 @@
                         context.getText(menuOption.labelResId)));
             }
         }
+
+        getRecentsView().addTaskAccessibilityActionsExtra(info);
     }
 
     @Override
     public boolean performAccessibilityAction(int action, Bundle arguments) {
         if (action == R.string.accessibility_close_task) {
-            ((RecentsView) getParent()).dismissTask(this, true /*animateTaskView*/,
+            getRecentsView().dismissTask(this, true /*animateTaskView*/,
                     true /*removeTask*/);
             return true;
         }
@@ -339,9 +342,15 @@
             }
         }
 
+        if (getRecentsView().performTaskAccessibilityActionExtra(action)) return true;
+
         return super.performAccessibilityAction(action, arguments);
     }
 
+    private RecentsView getRecentsView() {
+        return (RecentsView) getParent();
+    }
+
     public void notifyTaskLaunchFailed(String tag) {
         String msg = "Failed to launch task";
         if (mTask != null) {
diff --git a/res/layout/all_apps.xml b/res/layout/all_apps.xml
index 5e7b117..02d793e 100644
--- a/res/layout/all_apps.xml
+++ b/res/layout/all_apps.xml
@@ -23,8 +23,7 @@
     android:layout_height="match_parent"
     android:clipChildren="true"
     android:clipToPadding="false"
-    android:focusable="true"
-    android:focusableInTouchMode="true"
+    android:focusable="false"
     android:saveEnabled="false" >
 
     <include layout="@layout/all_apps_rv_layout" />
diff --git a/src/com/android/launcher3/AbstractFloatingView.java b/src/com/android/launcher3/AbstractFloatingView.java
index 5a1c158..c75509e 100644
--- a/src/com/android/launcher3/AbstractFloatingView.java
+++ b/src/com/android/launcher3/AbstractFloatingView.java
@@ -101,10 +101,12 @@
     }
 
     public final void close(boolean animate) {
-        animate &= !Utilities.isPowerSaverOn(getContext());
+        animate &= !Utilities.isPowerSaverPreventingAnimation(getContext());
+        if (mIsOpen) {
+            BaseActivity.fromContext(getContext()).getUserEventDispatcher()
+                    .resetElapsedContainerMillis("container closed");
+        }
         handleClose(animate);
-        BaseActivity.fromContext(getContext()).getUserEventDispatcher()
-                .resetElapsedContainerMillis("container closed");
         mIsOpen = false;
     }
 
@@ -121,9 +123,11 @@
 
     protected abstract boolean isOfType(@FloatingViewType int type);
 
-    public void onBackPressed() {
+    /** @return Whether the back is consumed. If false, Launcher will handle the back as well. */
+    public boolean onBackPressed() {
         logActionCommand(Action.Command.BACK);
         close(true);
+        return true;
     }
 
     @Override
diff --git a/src/com/android/launcher3/CellLayout.java b/src/com/android/launcher3/CellLayout.java
index 7979082..6c2fd8e 100644
--- a/src/com/android/launcher3/CellLayout.java
+++ b/src/com/android/launcher3/CellLayout.java
@@ -1980,7 +1980,7 @@
             // Animations are disabled in power save mode, causing the repeated animation to jump
             // spastically between beginning and end states. Since this looks bad, we don't repeat
             // the animation in power save mode.
-            if (!Utilities.isPowerSaverOn(getContext())) {
+            if (!Utilities.isPowerSaverPreventingAnimation(getContext())) {
                 va.setRepeatMode(ValueAnimator.REVERSE);
                 va.setRepeatCount(ValueAnimator.INFINITE);
             }
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index e851499..14390ec 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -50,6 +50,7 @@
 import android.os.AsyncTask;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.Handler;
 import android.os.Parcelable;
 import android.os.Process;
 import android.os.StrictMode;
@@ -243,6 +244,10 @@
 
     private RotationHelper mRotationHelper;
 
+
+    private final Handler mHandler = new Handler();
+    private final Runnable mLogOnDelayedResume = this::logOnDelayedResume;
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         if (DEBUG_STRICT_MODE) {
@@ -727,10 +732,11 @@
         if (mLauncherCallbacks != null) {
             mLauncherCallbacks.onStop();
         }
-        mAppWidgetHost.setListenIfResumed(false);
-
         getUserEventDispatcher().logActionCommand(Action.Command.STOP,
                 mStateManager.getState().containerType, -1);
+
+        mAppWidgetHost.setListenIfResumed(false);
+
         NotificationListener.removeNotificationsChangedListener();
         getStateManager().moveToRestState();
 
@@ -751,13 +757,23 @@
         UiFactory.onStart(this);
     }
 
+    private void logOnDelayedResume() {
+        if (hasBeenResumed()) {
+            getUserEventDispatcher().logActionCommand(Action.Command.RESUME,
+                    mStateManager.getState().containerType, -1);
+            getUserEventDispatcher().startSession();
+        }
+    }
+
     @Override
     protected void onResume() {
         TraceHelper.beginSection("ON_RESUME");
         super.onResume();
         TraceHelper.partitionSection("ON_RESUME", "superCall");
 
-        getUserEventDispatcher().resetElapsedSessionMillis();
+        mHandler.removeCallbacks(mLogOnDelayedResume);
+        Utilities.postAsyncCallback(mHandler, mLogOnDelayedResume);
+
         setOnResumeCallback(null);
         // Process any items that were added while Launcher was away.
         InstallShortcutReceiver.disableAndFlushInstallQueue(
@@ -1583,8 +1599,8 @@
         // by using if-else statements.
         UserEventDispatcher ued = getUserEventDispatcher();
         AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(this);
-        if (topView != null) {
-            topView.onBackPressed();
+        if (topView != null && topView.onBackPressed()) {
+            // Handled by the floating view.
         } else if (!isInState(NORMAL)) {
             LauncherState lastState = mStateManager.getLastState();
             ued.logActionCommand(Action.Command.BACK, mStateManager.getState().containerType,
diff --git a/src/com/android/launcher3/LauncherStateManager.java b/src/com/android/launcher3/LauncherStateManager.java
index e6fc4c6..3fcdee9 100644
--- a/src/com/android/launcher3/LauncherStateManager.java
+++ b/src/com/android/launcher3/LauncherStateManager.java
@@ -396,7 +396,6 @@
             setRestState(null);
         }
 
-        UiFactory.onLauncherStateOrFocusChanged(mLauncher);
         UiFactory.onLauncherStateOrResumeChanged(mLauncher);
     }
 
diff --git a/src/com/android/launcher3/PagedView.java b/src/com/android/launcher3/PagedView.java
index a98867d..efbd004 100644
--- a/src/com/android/launcher3/PagedView.java
+++ b/src/com/android/launcher3/PagedView.java
@@ -1495,12 +1495,20 @@
         return Math.abs(delta) > 0;
     }
 
-    public void scrollLeft() {
-        if (getNextPage() > 0) snapToPage(getNextPage() - 1);
+    public boolean scrollLeft() {
+        if (getNextPage() > 0) {
+            snapToPage(getNextPage() - 1);
+            return true;
+        }
+        return false;
     }
 
-    public void scrollRight() {
-        if (getNextPage() < getChildCount() -1) snapToPage(getNextPage() + 1);
+    public boolean scrollRight() {
+        if (getNextPage() < getChildCount() - 1) {
+            snapToPage(getNextPage() + 1);
+            return true;
+        }
+        return false;
     }
 
     @Override
@@ -1510,17 +1518,24 @@
         return ScrollView.class.getName();
     }
 
+    protected boolean isPageOrderFlipped() {
+        return false;
+    }
+
     /* Accessibility */
     @SuppressWarnings("deprecation")
     @Override
     public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
         super.onInitializeAccessibilityNodeInfo(info);
+        final boolean pagesFlipped = isPageOrderFlipped();
         info.setScrollable(getPageCount() > 1);
         if (getCurrentPage() < getPageCount() - 1) {
-            info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
+            info.addAction(pagesFlipped ? AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD
+                    : AccessibilityNodeInfo.ACTION_SCROLL_FORWARD);
         }
         if (getCurrentPage() > 0) {
-            info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
+            info.addAction(pagesFlipped ? AccessibilityNodeInfo.ACTION_SCROLL_FORWARD
+                    : AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD);
         }
 
         // Accessibility-wise, PagedView doesn't support long click, so disabling it.
@@ -1549,19 +1564,19 @@
         if (super.performAccessibilityAction(action, arguments)) {
             return true;
         }
+        final boolean pagesFlipped = isPageOrderFlipped();
         switch (action) {
             case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: {
-                if (getCurrentPage() < getPageCount() - 1) {
-                    scrollRight();
+                if (pagesFlipped ? scrollLeft() : scrollRight()) {
                     return true;
                 }
             } break;
             case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: {
-                if (getCurrentPage() > 0) {
-                    scrollLeft();
+                if (pagesFlipped ? scrollRight() : scrollLeft()) {
                     return true;
                 }
-            } break;
+            }
+            break;
         }
         return false;
     }
diff --git a/src/com/android/launcher3/Utilities.java b/src/com/android/launcher3/Utilities.java
index 006dc95..4bd9a9b 100644
--- a/src/com/android/launcher3/Utilities.java
+++ b/src/com/android/launcher3/Utilities.java
@@ -39,7 +39,6 @@
 import android.os.Message;
 import android.os.PowerManager;
 import android.os.TransactionTooLargeException;
-import android.support.v4.os.BuildCompat;
 import android.text.Spannable;
 import android.text.SpannableString;
 import android.text.TextUtils;
@@ -83,7 +82,8 @@
     private static final Matrix sMatrix = new Matrix();
     private static final Matrix sInverseMatrix = new Matrix();
 
-    public static final boolean ATLEAST_P = BuildCompat.isAtLeastP();
+    public static final boolean ATLEAST_P =
+            Build.VERSION.SDK_INT >= Build.VERSION_CODES.P;
 
     public static final boolean ATLEAST_OREO_MR1 =
             Build.VERSION.SDK_INT >= Build.VERSION_CODES.O_MR1;
@@ -492,7 +492,11 @@
                 LauncherFiles.DEVICE_PREFERENCES_KEY, Context.MODE_PRIVATE);
     }
 
-    public static boolean isPowerSaverOn(Context context) {
+    public static boolean isPowerSaverPreventingAnimation(Context context) {
+        if (ATLEAST_P) {
+            // Battery saver mode no longer prevents animations.
+            return false;
+        }
         PowerManager powerManager = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
         return powerManager.isPowerSaveMode();
     }
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 2df34d5..6631f77 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -2961,25 +2961,29 @@
     }
 
     @Override
-    public void scrollLeft() {
+    public boolean scrollLeft() {
+        boolean result = false;
         if (!workspaceInModalState() && !mIsSwitchingState) {
-            super.scrollLeft();
+            result = super.scrollLeft();
         }
         Folder openFolder = Folder.getOpen(mLauncher);
         if (openFolder != null) {
             openFolder.completeDragExit();
         }
+        return result;
     }
 
     @Override
-    public void scrollRight() {
+    public boolean scrollRight() {
+        boolean result = false;
         if (!workspaceInModalState() && !mIsSwitchingState) {
-            super.scrollRight();
+            result = super.scrollRight();
         }
         Folder openFolder = Folder.getOpen(mLauncher);
         if (openFolder != null) {
             openFolder.completeDragExit();
         }
+        return result;
     }
 
     /**
diff --git a/src/com/android/launcher3/allapps/DiscoveryBounce.java b/src/com/android/launcher3/allapps/DiscoveryBounce.java
index deaf8d3..e1cd06a 100644
--- a/src/com/android/launcher3/allapps/DiscoveryBounce.java
+++ b/src/com/android/launcher3/allapps/DiscoveryBounce.java
@@ -84,6 +84,14 @@
     }
 
     @Override
+    public boolean onBackPressed() {
+        super.onBackPressed();
+        // Go back to the previous state (from a user's perspective this floating view isn't
+        // something to go back from).
+        return false;
+    }
+
+    @Override
     public boolean onControllerInterceptTouchEvent(MotionEvent ev) {
         handleClose(false);
         return false;
diff --git a/src/com/android/launcher3/compat/UserManagerCompatVP.java b/src/com/android/launcher3/compat/UserManagerCompatVP.java
index 2e8a8eb..fa3902b 100644
--- a/src/com/android/launcher3/compat/UserManagerCompatVP.java
+++ b/src/com/android/launcher3/compat/UserManagerCompatVP.java
@@ -15,41 +15,20 @@
  */
 package com.android.launcher3.compat;
 
+import android.annotation.TargetApi;
 import android.content.Context;
+import android.os.Build;
 import android.os.UserHandle;
-import android.os.UserManager;
-import android.util.Log;
 
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-
+@TargetApi(Build.VERSION_CODES.P)
 public class UserManagerCompatVP extends UserManagerCompatVNMr1 {
-    private static final String TAG = "UserManagerCompatVP";
-
-    private Method mRequestQuietModeEnabled;
 
     UserManagerCompatVP(Context context) {
         super(context);
-        // TODO: Replace it with proper API call once SDK is ready.
-        try {
-            mRequestQuietModeEnabled = UserManager.class.getDeclaredMethod(
-                    "requestQuietModeEnabled", boolean.class, UserHandle.class);
-        } catch (NoSuchMethodException e) {
-            Log.e(TAG, "requestQuietModeEnabled is not available", e);
-        }
     }
 
     @Override
     public boolean requestQuietModeEnabled(boolean enableQuietMode, UserHandle user) {
-        if (mRequestQuietModeEnabled == null) {
-            return false;
-        }
-        try {
-            return (boolean)
-                    mRequestQuietModeEnabled.invoke(mUserManager, enableQuietMode, user);
-        } catch (IllegalAccessException | InvocationTargetException e) {
-            Log.e(TAG, "Failed to invoke mRequestQuietModeEnabled", e);
-        }
-        return false;
+        return mUserManager.requestQuietModeEnabled(enableQuietMode, user);
     }
 }
diff --git a/src/com/android/launcher3/folder/Folder.java b/src/com/android/launcher3/folder/Folder.java
index b49952f..6b13da7 100644
--- a/src/com/android/launcher3/folder/Folder.java
+++ b/src/com/android/launcher3/folder/Folder.java
@@ -1437,12 +1437,13 @@
     }
 
     @Override
-    public void onBackPressed() {
+    public boolean onBackPressed() {
         if (isEditingName()) {
             mFolderName.dispatchBackKey();
         } else {
             super.onBackPressed();
         }
+        return true;
     }
 
     @Override
diff --git a/src/com/android/launcher3/logging/UserEventDispatcher.java b/src/com/android/launcher3/logging/UserEventDispatcher.java
index 850c948..1842e19 100644
--- a/src/com/android/launcher3/logging/UserEventDispatcher.java
+++ b/src/com/android/launcher3/logging/UserEventDispatcher.java
@@ -125,6 +125,7 @@
         return null;
     }
 
+    private boolean mSessionStarted;
     private long mElapsedContainerMillis;
     private long mElapsedSessionMillis;
     private long mActionDurationMillis;
@@ -216,9 +217,11 @@
 
     public void logActionCommand(int command, Target srcTarget, Target dstTarget) {
         LauncherEvent event = newLauncherEvent(newCommandAction(command), srcTarget);
-        if (command == Action.Command.STOP && mAppOrTaskLaunch) {
-            // Prevent double logging by skipping STOP when app or task has been launched.
-            return;
+        if (command == Action.Command.STOP) {
+            if (mAppOrTaskLaunch || !mSessionStarted) {
+                mSessionStarted = false;
+                return;
+            }
         }
 
         if (dstTarget != null) {
@@ -405,7 +408,8 @@
 
     }
 
-    public final void resetElapsedSessionMillis() {
+    public final void startSession() {
+        mSessionStarted = true;
         mElapsedSessionMillis = SystemClock.uptimeMillis();
         mElapsedContainerMillis = SystemClock.uptimeMillis();
     }
diff --git a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
index e29250a..24382b7 100644
--- a/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
+++ b/src/com/android/launcher3/touch/AbstractStateChangeTouchController.java
@@ -209,11 +209,13 @@
                 @Override
                 public void onAnimationSuccess(Animator animation) {
                     cancelAtomicComponentsController();
-                    mAtomicComponentsStartProgress = mCurrentAnimation.getProgressFraction();
-                    long duration = (long) (getShiftRange() * 2);
-                    mAtomicComponentsController = AnimatorPlaybackController.wrap(
-                            createAtomicAnimForState(mFromState, mToState, duration), duration);
-                    mAtomicComponentsController.dispatchOnStart();
+                    if (mCurrentAnimation != null) {
+                        mAtomicComponentsStartProgress = mCurrentAnimation.getProgressFraction();
+                        long duration = (long) (getShiftRange() * 2);
+                        mAtomicComponentsController = AnimatorPlaybackController.wrap(
+                                createAtomicAnimForState(mFromState, mToState, duration), duration);
+                        mAtomicComponentsController.dispatchOnStart();
+                    }
                 }
             });
         }
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index 6bbce00..ea05cdc 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -118,6 +118,7 @@
         ViewCompat.setAccessibilityDelegate(this, mAccessibilityHelper);
 
         mAM = (AccessibilityManager) context.getSystemService(ACCESSIBILITY_SERVICE);
+        setFocusable(false);
     }
 
     @NonNull
diff --git a/src_ui_overrides/com/android/launcher3/uioverrides/UiFactory.java b/src_ui_overrides/com/android/launcher3/uioverrides/UiFactory.java
index e93dd5a..db98f9a 100644
--- a/src_ui_overrides/com/android/launcher3/uioverrides/UiFactory.java
+++ b/src_ui_overrides/com/android/launcher3/uioverrides/UiFactory.java
@@ -56,4 +56,6 @@
     }
 
     public static void prepareToShowOverview(Launcher launcher) { }
+
+    public static void setBackButtonAlpha(Launcher launcher, float alpha, boolean animate) { }
 }