diff --git a/go/res/values-v26/bools.xml b/go/res/values-v26/bools.xml
new file mode 100644
index 0000000..cc4a7ba
--- /dev/null
+++ b/go/res/values-v26/bools.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/* Copyright 2017, 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.
+*/
+-->
+
+<resources>
+    <bool name="notification_badging_enabled">false</bool>
+</resources>
\ No newline at end of file
diff --git a/go/res/values/override.xml b/go/res/values/override.xml
new file mode 100644
index 0000000..268cb98
--- /dev/null
+++ b/go/res/values/override.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+* Copyright (C) 2017 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.
+*/
+-->
+<resources>
+    <!-- String representing the intent to delete a package. -->
+    <string name="delete_package_intent" translatable="false">#Intent;action=android.intent.action.DELETE;launchFlags=0x10800000;B.android.intent.extra.RETURN_RESULT=true;end</string>
+</resources>
\ No newline at end of file
diff --git a/res/values/config.xml b/res/values/config.xml
index a62947e..b41172b 100644
--- a/res/values/config.xml
+++ b/res/values/config.xml
@@ -19,6 +19,9 @@
     q=<query> to the data to the intent -->
     <string name="market_search_intent" translatable="false">market://search?c=apps</string>
 
+    <!-- String representing the intent to delete a package.-->
+    <string name="delete_package_intent" translatable="false">#Intent;action=android.intent.action.DELETE;launchFlags=0x10800000;end</string>
+
     <!-- Values for icon shape overrides. These should correspond to entries defined
      in icon_shape_override_paths_names -->
     <string-array translatable="false" name="icon_shape_override_paths_values">
diff --git a/src/com/android/launcher3/AppWidgetResizeFrame.java b/src/com/android/launcher3/AppWidgetResizeFrame.java
index 1a405f9..a486a3a 100644
--- a/src/com/android/launcher3/AppWidgetResizeFrame.java
+++ b/src/com/android/launcher3/AppWidgetResizeFrame.java
@@ -55,7 +55,6 @@
 
     private final int[] mDirectionVector = new int[2];
     private final int[] mLastDirectionVector = new int[2];
-    private final int[] mTmpPt = new int[2];
 
     private final IntRange mTempRange1 = new IntRange();
     private final IntRange mTempRange2 = new IntRange();
@@ -344,13 +343,12 @@
         return rect;
     }
 
-    /**
-     * This is the final step of the resize. Here we save the new widget size and position
-     * to LauncherModel and animate the resize frame.
-     */
-    public void commitResize() {
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+
+        // We are done with resizing the widget. Save the widget size & position to LauncherModel
         resizeWidgetIfNeeded(true);
-        requestLayout();
     }
 
     private void onTouchUp() {
diff --git a/src/com/android/launcher3/BaseContainerView.java b/src/com/android/launcher3/BaseContainerView.java
index c55a586..82175b7 100644
--- a/src/com/android/launcher3/BaseContainerView.java
+++ b/src/com/android/launcher3/BaseContainerView.java
@@ -62,7 +62,7 @@
     public BaseContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
 
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && this instanceof AllAppsContainerView) {
+        if (this instanceof AllAppsContainerView) {
             mBaseDrawable = new ColorDrawable();
         } else {
             TypedArray a = context.obtainStyledAttributes(attrs,
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index e229d6c..8492a79 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -1310,9 +1310,7 @@
         mDragController.addDropTarget(mWorkspace);
         mDropTargetBar.setup(mDragController);
 
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
-            mAllAppsController.setupViews(mAppsView, mHotseat, mWorkspace);
-        }
+        mAllAppsController.setupViews(mAppsView, mHotseat, mWorkspace);
 
         if (TestingUtils.MEMORY_DUMP_ENABLED) {
             TestingUtils.addWeightWatcher(this);
@@ -2280,7 +2278,7 @@
             if (v instanceof FolderIcon) {
                 onClickFolderIcon(v);
             }
-        } else if ((FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && v instanceof PageIndicator) ||
+        } else if ((v instanceof PageIndicator) ||
             (v == mAllAppsButton && mAllAppsButton != null)) {
             onClickAllAppsButton(v);
         } else if (tag instanceof AppInfo) {
@@ -3763,16 +3761,12 @@
      * Implementation of the method from LauncherModel.Callbacks.
      *
      * @param updated list of shortcuts which have changed.
-     * @param removed list of shortcuts which were deleted in the background. This can happen when
-     *                an app gets removed from the system or some of its components are no longer
-     *                available.
      */
     @Override
-    public void bindShortcutsChanged(final ArrayList<ShortcutInfo> updated,
-            final ArrayList<ShortcutInfo> removed, final UserHandle user) {
+    public void bindShortcutsChanged(final ArrayList<ShortcutInfo> updated, final UserHandle user) {
         Runnable r = new Runnable() {
             public void run() {
-                bindShortcutsChanged(updated, removed, user);
+                bindShortcutsChanged(updated, user);
             }
         };
         if (waitUntilResume(r)) {
@@ -3782,31 +3776,6 @@
         if (!updated.isEmpty()) {
             mWorkspace.updateShortcuts(updated);
         }
-
-        if (!removed.isEmpty()) {
-            HashSet<ComponentName> removedComponents = new HashSet<>();
-            HashSet<ShortcutKey> removedDeepShortcuts = new HashSet<>();
-
-            for (ShortcutInfo si : removed) {
-                if (si.itemType == Favorites.ITEM_TYPE_DEEP_SHORTCUT) {
-                    removedDeepShortcuts.add(ShortcutKey.fromItemInfo(si));
-                } else {
-                    removedComponents.add(si.getTargetComponent());
-                }
-            }
-
-            if (!removedComponents.isEmpty()) {
-                ItemInfoMatcher matcher = ItemInfoMatcher.ofComponents(removedComponents, user);
-                mWorkspace.removeItemsByMatcher(matcher);
-                mDragController.onAppsRemoved(matcher);
-            }
-
-            if (!removedDeepShortcuts.isEmpty()) {
-                ItemInfoMatcher matcher = ItemInfoMatcher.ofShortcutKeys(removedDeepShortcuts);
-                mWorkspace.removeItemsByMatcher(matcher);
-                mDragController.onAppsRemoved(matcher);
-            }
-        }
     }
 
     /**
@@ -3836,28 +3805,17 @@
      * package-removal should clear all items by package name.
      */
     @Override
-    public void bindWorkspaceComponentsRemoved(
-            final HashSet<String> packageNames, final HashSet<ComponentName> components,
-            final UserHandle user) {
+    public void bindWorkspaceComponentsRemoved(final ItemInfoMatcher matcher) {
         Runnable r = new Runnable() {
             public void run() {
-                bindWorkspaceComponentsRemoved(packageNames, components, user);
+                bindWorkspaceComponentsRemoved(matcher);
             }
         };
         if (waitUntilResume(r)) {
             return;
         }
-        if (!packageNames.isEmpty()) {
-            ItemInfoMatcher matcher = ItemInfoMatcher.ofPackages(packageNames, user);
-            mWorkspace.removeItemsByMatcher(matcher);
-            mDragController.onAppsRemoved(matcher);
-
-        }
-        if (!components.isEmpty()) {
-            ItemInfoMatcher matcher = ItemInfoMatcher.ofComponents(components, user);
-            mWorkspace.removeItemsByMatcher(matcher);
-            mDragController.onAppsRemoved(matcher);
-        }
+        mWorkspace.removeItemsByMatcher(matcher);
+        mDragController.onAppsRemoved(matcher);
     }
 
     @Override
diff --git a/src/com/android/launcher3/LauncherModel.java b/src/com/android/launcher3/LauncherModel.java
index 22d62ec..a906b00 100644
--- a/src/com/android/launcher3/LauncherModel.java
+++ b/src/com/android/launcher3/LauncherModel.java
@@ -56,6 +56,7 @@
 import com.android.launcher3.shortcuts.DeepShortcutManager;
 import com.android.launcher3.shortcuts.ShortcutInfoCompat;
 import com.android.launcher3.util.ComponentKey;
+import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.MultiHashMap;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.Preconditions;
@@ -148,13 +149,10 @@
                                   ArrayList<ItemInfo> addNotAnimated,
                                   ArrayList<ItemInfo> addAnimated);
         public void bindPromiseAppProgressUpdated(PromiseAppInfo app);
-        public void bindShortcutsChanged(ArrayList<ShortcutInfo> updated,
-                ArrayList<ShortcutInfo> removed, UserHandle user);
+        public void bindShortcutsChanged(ArrayList<ShortcutInfo> updated, UserHandle user);
         public void bindWidgetsRestored(ArrayList<LauncherAppWidgetInfo> widgets);
         public void bindRestoreItemsChange(HashSet<ItemInfo> updates);
-        public void bindWorkspaceComponentsRemoved(
-                HashSet<String> packageNames, HashSet<ComponentName> components,
-                UserHandle user);
+        public void bindWorkspaceComponentsRemoved(ItemInfoMatcher matcher);
         public void bindAppInfosRemoved(ArrayList<AppInfo> appInfos);
         public void bindAllWidgets(MultiHashMap<PackageItemInfo, WidgetItem> widgets);
         public void onPageBoundSynchronously(int page);
diff --git a/src/com/android/launcher3/LauncherStateTransitionAnimation.java b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
index 9ff61ec..e247490 100644
--- a/src/com/android/launcher3/LauncherStateTransitionAnimation.java
+++ b/src/com/android/launcher3/LauncherStateTransitionAnimation.java
@@ -80,13 +80,11 @@
 public class LauncherStateTransitionAnimation {
 
     /**
-     * animation used for all apps and widget tray when
-     *{@link FeatureFlags#LAUNCHER3_ALL_APPS_PULL_UP} is {@code false}
+     * animation used for the widget tray
      */
     public static final int CIRCULAR_REVEAL = 0;
     /**
-     * animation used for all apps and not widget tray when
-     *{@link FeatureFlags#LAUNCHER3_ALL_APPS_PULL_UP} is {@code true}
+     * animation used for all apps tray
      */
     public static final int PULLUP = 1;
 
@@ -154,13 +152,9 @@
                 mLauncher.getUserEventDispatcher().resetElapsedContainerMillis();
             }
         };
-        int animType = CIRCULAR_REVEAL;
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
-            animType = PULLUP;
-        }
         // Only animate the search bar if animating from spring loaded mode back to all apps
         startAnimationToOverlay(
-                Workspace.State.NORMAL_HIDDEN, buttonView, toView, animated, animType, cb);
+                Workspace.State.NORMAL_HIDDEN, buttonView, toView, animated, PULLUP, cb);
     }
 
     /**
@@ -193,12 +187,8 @@
 
         if (fromState == Launcher.State.APPS || fromState == Launcher.State.APPS_SPRING_LOADED
                 || mAllAppsController.isTransitioning()) {
-            int animType = CIRCULAR_REVEAL;
-            if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
-                animType = PULLUP;
-            }
             startAnimationToWorkspaceFromAllApps(fromWorkspaceState, toWorkspaceState,
-                    animated, animType, onCompleteRunnable);
+                    animated, PULLUP, onCompleteRunnable);
         } else if (fromState == Launcher.State.WIDGETS ||
                 fromState == Launcher.State.WIDGETS_SPRING_LOADED) {
             startAnimationToWorkspaceFromWidgets(fromWorkspaceState, toWorkspaceState,
@@ -235,8 +225,7 @@
         playCommonTransitionAnimations(toWorkspaceState,
                 animated, initialized, animation, layerViews);
         if (!animated || !initialized) {
-            if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP &&
-                    toWorkspaceState == Workspace.State.NORMAL_HIDDEN) {
+            if (toWorkspaceState == Workspace.State.NORMAL_HIDDEN) {
                 mAllAppsController.finishPullUp();
             }
             toView.setTranslationX(0.0f);
@@ -527,8 +516,7 @@
         playCommonTransitionAnimations(toWorkspaceState,
                 animated, initialized, animation, layerViews);
         if (!animated || !initialized) {
-            if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP &&
-                    fromWorkspaceState == Workspace.State.NORMAL_HIDDEN) {
+            if (fromWorkspaceState == Workspace.State.NORMAL_HIDDEN) {
                 mAllAppsController.finishPullDown();
             }
             fromView.setVisibility(View.GONE);
diff --git a/src/com/android/launcher3/SettingsActivity.java b/src/com/android/launcher3/SettingsActivity.java
index 9046372..5bdc1f5 100644
--- a/src/com/android/launcher3/SettingsActivity.java
+++ b/src/com/android/launcher3/SettingsActivity.java
@@ -98,6 +98,8 @@
                 getPreferenceScreen().removePreference(
                         findPreference(SessionCommitReceiver.ADD_ICON_PREFERENCE_KEY));
                 getPreferenceScreen().removePreference(iconBadgingPref);
+            } else if (!getResources().getBoolean(R.bool.notification_badging_enabled)) {
+                getPreferenceScreen().removePreference(iconBadgingPref);
             } else {
                 // Listen to system notification badge settings while this UI is active.
                 mIconBadgingObserver = new IconBadgingObserver(
diff --git a/src/com/android/launcher3/UninstallDropTarget.java b/src/com/android/launcher3/UninstallDropTarget.java
index e15cf9f..84d6a9b 100644
--- a/src/com/android/launcher3/UninstallDropTarget.java
+++ b/src/com/android/launcher3/UninstallDropTarget.java
@@ -11,12 +11,17 @@
 import android.os.UserHandle;
 import android.os.UserManager;
 import android.util.AttributeSet;
+import android.util.Log;
 import android.widget.Toast;
 
 import com.android.launcher3.compat.LauncherAppsCompat;
 
+import java.net.URISyntaxException;
+
 public class UninstallDropTarget extends ButtonDropTarget {
 
+    private static final String TAG = "UninstallDropTarget";
+
     public UninstallDropTarget(Context context, AttributeSet attrs) {
         this(context, attrs, 0);
     }
@@ -99,25 +104,28 @@
             final Launcher launcher, ItemInfo info, DropTargetResultCallback callback) {
         final ComponentName cn = getUninstallTarget(launcher, info);
 
-        final boolean isUninstallable;
+        boolean canUninstall;
         if (cn == null) {
             // System applications cannot be installed. For now, show a toast explaining that.
             // We may give them the option of disabling apps this way.
             Toast.makeText(launcher, R.string.uninstall_system_app_text, Toast.LENGTH_SHORT).show();
-            isUninstallable = false;
+            canUninstall = false;
         } else {
-            Intent intent = new Intent(Intent.ACTION_DELETE,
-                    Uri.fromParts("package", cn.getPackageName(), cn.getClassName()))
-                    .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
-                            | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
-            intent.putExtra(Intent.EXTRA_USER, info.user);
-            launcher.startActivity(intent);
-            isUninstallable = true;
+            try {
+                Intent i = Intent.parseUri(launcher.getString(R.string.delete_package_intent), 0)
+                        .setData(Uri.fromParts("package", cn.getPackageName(), cn.getClassName()))
+                        .putExtra(Intent.EXTRA_USER, info.user);
+                launcher.startActivity(i);
+                canUninstall = true;
+            } catch (URISyntaxException e) {
+                Log.e(TAG, "Failed to parse intent to start uninstall activity for item=" + info);
+                canUninstall = false;
+            }
         }
         if (callback != null) {
-            sendUninstallResult(launcher, isUninstallable, cn, info.user, callback);
+            sendUninstallResult(launcher, canUninstall, cn, info.user, callback);
         }
-        return isUninstallable;
+        return canUninstall;
     }
 
     /**
diff --git a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
index 76772dc..a105a73 100644
--- a/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
+++ b/src/com/android/launcher3/WorkspaceStateTransitionAnimation.java
@@ -273,9 +273,8 @@
         float finalBackgroundAlpha = (states.stateIsSpringLoaded || states.stateIsOverview) ?
                 1.0f : 0f;
         float finalHotseatAlpha = (states.stateIsNormal || states.stateIsSpringLoaded ||
-                (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && states.stateIsNormalHidden)) ? 1f : 0f;
-        float finalQsbAlpha = (states.stateIsNormal ||
-                (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && states.stateIsNormalHidden)) ? 1f : 0f;
+                states.stateIsNormalHidden) ? 1f : 0f;
+        float finalQsbAlpha = (states.stateIsNormal || states.stateIsNormalHidden) ? 1f : 0f;
 
         float finalWorkspaceTranslationY = 0;
         if (states.stateIsOverview || states.stateIsOverviewHidden) {
@@ -312,8 +311,7 @@
             if (states.stateIsOverviewHidden) {
                 finalAlpha = 0f;
             } else if(states.stateIsNormalHidden) {
-                finalAlpha = (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP &&
-                        i == mWorkspace.getNextPage()) ? 1 : 0;
+                finalAlpha = (i == mWorkspace.getNextPage()) ? 1 : 0;
             } else if (states.stateIsNormal && mWorkspaceFadeInAdjacentScreens) {
                 finalAlpha = (i == toPage || i < customPageCount) ? 1f : 0f;
             } else {
@@ -322,7 +320,7 @@
 
             // If we are animating to/from the small state, then hide the side pages and fade the
             // current page in
-            if (!FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && !mWorkspace.isSwitchingState()) {
+            if (!FeatureFlags.NO_ALL_APPS_ICON && !mWorkspace.isSwitchingState()) {
                 if (states.workspaceToAllApps || states.allAppsToWorkspace) {
                     boolean isCurrentPage = (i == toPage);
                     if (states.allAppsToWorkspace && isCurrentPage) {
diff --git a/src/com/android/launcher3/allapps/AllAppsContainerView.java b/src/com/android/launcher3/allapps/AllAppsContainerView.java
index 0d512ab..97a87c1 100644
--- a/src/com/android/launcher3/allapps/AllAppsContainerView.java
+++ b/src/com/android/launcher3/allapps/AllAppsContainerView.java
@@ -102,18 +102,14 @@
     @Override
     protected void updateBackground(
             int paddingLeft, int paddingTop, int paddingRight, int paddingBottom) {
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
-            if (mLauncher.getDeviceProfile().isVerticalBarLayout()) {
-                getRevealView().setBackground(new InsetDrawable(mBaseDrawable,
-                        paddingLeft, paddingTop, paddingRight, paddingBottom));
-                getContentView().setBackground(
-                        new InsetDrawable(new ColorDrawable(Color.TRANSPARENT),
-                                paddingLeft, paddingTop, paddingRight, paddingBottom));
-            } else {
-                getRevealView().setBackground(mBaseDrawable);
-            }
+        if (mLauncher.getDeviceProfile().isVerticalBarLayout()) {
+            getRevealView().setBackground(new InsetDrawable(mBaseDrawable,
+                    paddingLeft, paddingTop, paddingRight, paddingBottom));
+            getContentView().setBackground(
+                    new InsetDrawable(new ColorDrawable(Color.TRANSPARENT),
+                            paddingLeft, paddingTop, paddingRight, paddingBottom));
         } else {
-            super.updateBackground(paddingLeft, paddingTop, paddingRight, paddingBottom);
+            getRevealView().setBackground(mBaseDrawable);
         }
     }
 
@@ -232,11 +228,9 @@
         mAppsRecyclerView.preMeasureViews(mAdapter);
         mAdapter.setIconFocusListener(focusedItemDecorator.getFocusListener());
 
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
-            getRevealView().setVisibility(View.VISIBLE);
-            getContentView().setVisibility(View.VISIBLE);
-            getContentView().setBackground(null);
-        }
+        getRevealView().setVisibility(View.VISIBLE);
+        getContentView().setVisibility(View.VISIBLE);
+        getContentView().setBackground(null);
     }
 
     public SearchUiManager getSearchUiManager() {
@@ -254,32 +248,15 @@
         // Update the number of items in the grid before we measure the view
         grid.updateAppsViewNumCols();
 
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
-            if (mNumAppsPerRow != grid.inv.numColumns ||
-                    mNumPredictedAppsPerRow != grid.inv.numColumns) {
-                mNumAppsPerRow = grid.inv.numColumns;
-                mNumPredictedAppsPerRow = grid.inv.numColumns;
-
-                mAppsRecyclerView.setNumAppsPerRow(grid, mNumAppsPerRow);
-                mAdapter.setNumAppsPerRow(mNumAppsPerRow);
-                mApps.setNumAppsPerRow(mNumAppsPerRow, mNumPredictedAppsPerRow);
-            }
-            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
-            return;
-        }
-
-        // --- remove START when {@code FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP} is enabled. ---
-        if (mNumAppsPerRow != grid.allAppsNumCols ||
-                mNumPredictedAppsPerRow != grid.allAppsNumPredictiveCols) {
-            mNumAppsPerRow = grid.allAppsNumCols;
-            mNumPredictedAppsPerRow = grid.allAppsNumPredictiveCols;
+        if (mNumAppsPerRow != grid.inv.numColumns ||
+                mNumPredictedAppsPerRow != grid.inv.numColumns) {
+            mNumAppsPerRow = grid.inv.numColumns;
+            mNumPredictedAppsPerRow = grid.inv.numColumns;
 
             mAppsRecyclerView.setNumAppsPerRow(grid, mNumAppsPerRow);
             mAdapter.setNumAppsPerRow(mNumAppsPerRow);
             mApps.setNumAppsPerRow(mNumAppsPerRow, mNumPredictedAppsPerRow);
         }
-
-        // --- remove END when {@code FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP} is enabled. ---
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
 
diff --git a/src/com/android/launcher3/allapps/search/AppsSearchContainerLayout.java b/src/com/android/launcher3/allapps/search/AppsSearchContainerLayout.java
index 39e2088..d504551 100644
--- a/src/com/android/launcher3/allapps/search/AppsSearchContainerLayout.java
+++ b/src/com/android/launcher3/allapps/search/AppsSearchContainerLayout.java
@@ -108,8 +108,7 @@
 
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP &&
-                !mLauncher.getDeviceProfile().isVerticalBarLayout()) {
+        if (!mLauncher.getDeviceProfile().isVerticalBarLayout()) {
             getLayoutParams().height = mLauncher.getDragLayer().getInsets().top + mMinHeight;
         }
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
diff --git a/src/com/android/launcher3/compat/WallpaperManagerCompatVOMR1.java b/src/com/android/launcher3/compat/WallpaperManagerCompatVOMR1.java
index 6233fab..fe5ff2a 100644
--- a/src/com/android/launcher3/compat/WallpaperManagerCompatVOMR1.java
+++ b/src/com/android/launcher3/compat/WallpaperManagerCompatVOMR1.java
@@ -20,6 +20,7 @@
 import android.content.Context;
 import android.graphics.Color;
 import android.os.Build;
+import android.os.Handler;
 import android.support.annotation.Nullable;
 import android.util.Log;
 
@@ -48,8 +49,7 @@
 
         mOCLClass = Class.forName("android.app.WallpaperManager$OnColorsChangedListener");
         mAddOCLMethod = WallpaperManager.class.getDeclaredMethod(
-                "addOnColorsChangedListener", mOCLClass);
-
+                "addOnColorsChangedListener", mOCLClass, Handler.class);
         mWCGetMethod = WallpaperManager.class.getDeclaredMethod("getWallpaperColors", int.class);
         Class wallpaperColorsClass = mWCGetMethod.getReturnType();
         mWCGetPrimaryColorMethod = wallpaperColorsClass.getDeclaredMethod("getPrimaryColor");
@@ -89,7 +89,7 @@
                     }
                 });
         try {
-            mAddOCLMethod.invoke(mWm, onChangeListener);
+            mAddOCLMethod.invoke(mWm, onChangeListener, null);
         } catch (Exception e) {
             Log.e(TAG, "Error calling wallpaper API", e);
         }
diff --git a/src/com/android/launcher3/config/BaseFlags.java b/src/com/android/launcher3/config/BaseFlags.java
index 7964dd1..6a4cbcb 100644
--- a/src/com/android/launcher3/config/BaseFlags.java
+++ b/src/com/android/launcher3/config/BaseFlags.java
@@ -34,7 +34,6 @@
     public static boolean LAUNCHER3_DISABLE_ICON_NORMALIZATION = false;
     public static boolean LAUNCHER3_LEGACY_FOLDER_ICON = false;
     public static boolean LAUNCHER3_DISABLE_PINCH_TO_OVERVIEW = false;
-    public static boolean LAUNCHER3_ALL_APPS_PULL_UP = true;
     public static boolean LAUNCHER3_NEW_FOLDER_ANIMATION = true;
     // When enabled allows to use any point on the fast scrollbar to start dragging.
     public static final boolean LAUNCHER3_DIRECT_SCROLL = true;
@@ -57,8 +56,6 @@
     public static final boolean PULLDOWN_SEARCH = false;
     // When enabled the status bar may show dark icons based on the top of the wallpaper.
     public static final boolean LIGHT_STATUS_BAR = false;
-    // When enabled icons are badged with the number of notifications associated with that app.
-    public static final boolean BADGE_ICONS = true;
     // When enabled, icons not supporting {@link AdaptiveIconDrawable} will be wrapped in {@link FixedScaleDrawable}.
     public static final boolean LEGACY_ICON_TREATMENT = true;
     // When enabled, adaptive icons would have shadows baked when being stored to icon cache.
diff --git a/src/com/android/launcher3/dragndrop/DragLayer.java b/src/com/android/launcher3/dragndrop/DragLayer.java
index be5f01a..fde7995 100644
--- a/src/com/android/launcher3/dragndrop/DragLayer.java
+++ b/src/com/android/launcher3/dragndrop/DragLayer.java
@@ -243,7 +243,7 @@
             return true;
         }
 
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP && mAllAppsController.onControllerInterceptTouchEvent(ev)) {
+        if (mAllAppsController.onControllerInterceptTouchEvent(ev)) {
             mActiveController = mAllAppsController;
             return true;
         }
@@ -544,7 +544,6 @@
 
     public void clearResizeFrame() {
         if (mCurrentResizeFrame != null) {
-            mCurrentResizeFrame.commitResize();
             removeView(mCurrentResizeFrame);
             mCurrentResizeFrame = null;
         }
diff --git a/src/com/android/launcher3/model/BaseModelUpdateTask.java b/src/com/android/launcher3/model/BaseModelUpdateTask.java
index 9b4510f..d5b5aa7 100644
--- a/src/com/android/launcher3/model/BaseModelUpdateTask.java
+++ b/src/com/android/launcher3/model/BaseModelUpdateTask.java
@@ -26,6 +26,7 @@
 import com.android.launcher3.LauncherModel.Callbacks;
 import com.android.launcher3.ShortcutInfo;
 import com.android.launcher3.util.ComponentKey;
+import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.MultiHashMap;
 
 import java.util.ArrayList;
@@ -94,19 +95,12 @@
 
 
     public void bindUpdatedShortcuts(
-            ArrayList<ShortcutInfo> updatedShortcuts, UserHandle user) {
-        bindUpdatedShortcuts(updatedShortcuts, new ArrayList<ShortcutInfo>(), user);
-    }
-
-    public void bindUpdatedShortcuts(
-            final ArrayList<ShortcutInfo> updatedShortcuts,
-            final ArrayList<ShortcutInfo> removedShortcuts,
-            final UserHandle user) {
-        if (!updatedShortcuts.isEmpty() || !removedShortcuts.isEmpty()) {
+            final ArrayList<ShortcutInfo> updatedShortcuts, final UserHandle user) {
+        if (!updatedShortcuts.isEmpty()) {
             scheduleCallbackTask(new CallbackTask() {
                 @Override
                 public void execute(Callbacks callbacks) {
-                    callbacks.bindShortcutsChanged(updatedShortcuts, removedShortcuts, user);
+                    callbacks.bindShortcutsChanged(updatedShortcuts, user);
                 }
             });
         }
@@ -132,4 +126,16 @@
             }
         });
     }
+
+    public void deleteAndBindComponentsRemoved(final ItemInfoMatcher matcher) {
+        getModelWriter().deleteItemsFromDatabase(matcher);
+
+        // Call the components-removed callback
+        scheduleCallbackTask(new CallbackTask() {
+            @Override
+            public void execute(Callbacks callbacks) {
+                callbacks.bindWorkspaceComponentsRemoved(matcher);
+            }
+        });
+    }
 }
diff --git a/src/com/android/launcher3/model/PackageUpdatedTask.java b/src/com/android/launcher3/model/PackageUpdatedTask.java
index c6e878c..6c78d5b 100644
--- a/src/com/android/launcher3/model/PackageUpdatedTask.java
+++ b/src/com/android/launcher3/model/PackageUpdatedTask.java
@@ -43,6 +43,7 @@
 import com.android.launcher3.graphics.LauncherIcons;
 import com.android.launcher3.util.FlagOp;
 import com.android.launcher3.util.ItemInfoMatcher;
+import com.android.launcher3.util.LongArrayMap;
 import com.android.launcher3.util.PackageManagerHelper;
 import com.android.launcher3.util.PackageUserKey;
 import java.util.ArrayList;
@@ -172,7 +173,7 @@
         // Update shortcut infos
         if (mOp == OP_ADD || flagOp != FlagOp.NO_OP) {
             final ArrayList<ShortcutInfo> updatedShortcuts = new ArrayList<>();
-            final ArrayList<ShortcutInfo> removedShortcuts = new ArrayList<>();
+            final LongArrayMap<Boolean> removedShortcuts = new LongArrayMap<>();
             final ArrayList<LauncherAppWidgetInfo> widgets = new ArrayList<>();
 
             synchronized (dataModel) {
@@ -213,7 +214,7 @@
                                         }
 
                                         if ((intent == null) || (appInfo == null)) {
-                                            removedShortcuts.add(si);
+                                            removedShortcuts.put(si.id, true);
                                             continue;
                                         }
                                         si.intent = intent;
@@ -267,9 +268,9 @@
                 }
             }
 
-            bindUpdatedShortcuts(updatedShortcuts, removedShortcuts, mUser);
+            bindUpdatedShortcuts(updatedShortcuts, mUser);
             if (!removedShortcuts.isEmpty()) {
-                getModelWriter().deleteItemsFromDatabase(removedShortcuts);
+                deleteAndBindComponentsRemoved(ItemInfoMatcher.ofItemIds(removedShortcuts, false));
             }
 
             if (!widgets.isEmpty()) {
@@ -306,22 +307,12 @@
         }
 
         if (!removedPackages.isEmpty() || !removedComponents.isEmpty()) {
-            getModelWriter().deleteItemsFromDatabase(
-                    ItemInfoMatcher.ofPackages(removedPackages, mUser));
-            getModelWriter().deleteItemsFromDatabase(
-                    ItemInfoMatcher.ofComponents(removedComponents, mUser));
+            ItemInfoMatcher removeMatch = ItemInfoMatcher.ofPackages(removedPackages, mUser)
+                    .or(ItemInfoMatcher.ofComponents(removedComponents, mUser));
+            deleteAndBindComponentsRemoved(removeMatch);
 
             // Remove any queued items from the install queue
             InstallShortcutReceiver.removeFromInstallQueue(context, removedPackages, mUser);
-
-            // Call the components-removed callback
-            scheduleCallbackTask(new CallbackTask() {
-                @Override
-                public void execute(Callbacks callbacks) {
-                    callbacks.bindWorkspaceComponentsRemoved(
-                            removedPackages, removedComponents, mUser);
-                }
-            });
         }
 
         if (!removedApps.isEmpty()) {
diff --git a/src/com/android/launcher3/model/ShortcutsChangedTask.java b/src/com/android/launcher3/model/ShortcutsChangedTask.java
index 17cc238..c1f33a6 100644
--- a/src/com/android/launcher3/model/ShortcutsChangedTask.java
+++ b/src/com/android/launcher3/model/ShortcutsChangedTask.java
@@ -26,9 +26,12 @@
 import com.android.launcher3.graphics.LauncherIcons;
 import com.android.launcher3.shortcuts.DeepShortcutManager;
 import com.android.launcher3.shortcuts.ShortcutInfoCompat;
+import com.android.launcher3.shortcuts.ShortcutKey;
+import com.android.launcher3.util.ItemInfoMatcher;
 import com.android.launcher3.util.MultiHashMap;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
 
 /**
@@ -56,33 +59,35 @@
         deepShortcutManager.onShortcutsChanged(mShortcuts);
 
         // Find ShortcutInfo's that have changed on the workspace.
-        final ArrayList<ShortcutInfo> removedShortcutInfos = new ArrayList<>();
-        MultiHashMap<String, ShortcutInfo> idsToWorkspaceShortcutInfos = new MultiHashMap<>();
+        HashSet<ShortcutKey> removedKeys = new HashSet<>();
+        MultiHashMap<ShortcutKey, ShortcutInfo> keyToShortcutInfo = new MultiHashMap<>();
+        HashSet<String> allIds = new HashSet<>();
+
         for (ItemInfo itemInfo : dataModel.itemsIdMap) {
             if (itemInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT) {
                 ShortcutInfo si = (ShortcutInfo) itemInfo;
-                if (si.getIntent().getPackage().equals(mPackageName)
-                        && si.user.equals(mUser)) {
-                    idsToWorkspaceShortcutInfos.addToList(si.getDeepShortcutId(), si);
+                if (si.getIntent().getPackage().equals(mPackageName) && si.user.equals(mUser)) {
+                    keyToShortcutInfo.addToList(ShortcutKey.fromItemInfo(si), si);
+                    allIds.add(si.getDeepShortcutId());
                 }
             }
         }
 
         final ArrayList<ShortcutInfo> updatedShortcutInfos = new ArrayList<>();
-        if (!idsToWorkspaceShortcutInfos.isEmpty()) {
+        if (!keyToShortcutInfo.isEmpty()) {
             // Update the workspace to reflect the changes to updated shortcuts residing on it.
             List<ShortcutInfoCompat> shortcuts = deepShortcutManager.queryForFullDetails(
-                    mPackageName, new ArrayList<>(idsToWorkspaceShortcutInfos.keySet()), mUser);
+                    mPackageName, new ArrayList<>(allIds), mUser);
             for (ShortcutInfoCompat fullDetails : shortcuts) {
-                List<ShortcutInfo> shortcutInfos = idsToWorkspaceShortcutInfos
-                        .remove(fullDetails.getId());
+                ShortcutKey key = ShortcutKey.fromInfo(fullDetails);
+                List<ShortcutInfo> shortcutInfos = keyToShortcutInfo.remove(key);
                 if (!fullDetails.isPinned()) {
                     // The shortcut was previously pinned but is no longer, so remove it from
                     // the workspace and our pinned shortcut counts.
                     // Note that we put this check here, after querying for full details,
                     // because there's a possible race condition between pinning and
                     // receiving this callback.
-                    removedShortcutInfos.addAll(shortcutInfos);
+                    removedKeys.add(key);
                     continue;
                 }
                 for (final ShortcutInfo shortcutInfo : shortcutInfos) {
@@ -94,16 +99,14 @@
             }
         }
 
-        // If there are still entries in idsToWorkspaceShortcutInfos, that means that
+        // If there are still entries in keyToShortcutInfo, that means that
         // the corresponding shortcuts weren't passed in onShortcutsChanged(). This
         // means they were cleared, so we remove and unpin them now.
-        for (String id : idsToWorkspaceShortcutInfos.keySet()) {
-            removedShortcutInfos.addAll(idsToWorkspaceShortcutInfos.get(id));
-        }
+        removedKeys.addAll(keyToShortcutInfo.keySet());
 
-        bindUpdatedShortcuts(updatedShortcutInfos, removedShortcutInfos, mUser);
-        if (!removedShortcutInfos.isEmpty()) {
-            getModelWriter().deleteItemsFromDatabase(removedShortcutInfos);
+        bindUpdatedShortcuts(updatedShortcutInfos, mUser);
+        if (!keyToShortcutInfo.isEmpty()) {
+            deleteAndBindComponentsRemoved(ItemInfoMatcher.ofShortcutKeys(removedKeys));
         }
 
         if (mUpdateIdMap) {
diff --git a/src/com/android/launcher3/model/UserLockStateChangedTask.java b/src/com/android/launcher3/model/UserLockStateChangedTask.java
index 802771f..8170f9a 100644
--- a/src/com/android/launcher3/model/UserLockStateChangedTask.java
+++ b/src/com/android/launcher3/model/UserLockStateChangedTask.java
@@ -29,9 +29,11 @@
 import com.android.launcher3.shortcuts.ShortcutInfoCompat;
 import com.android.launcher3.shortcuts.ShortcutKey;
 import com.android.launcher3.util.ComponentKey;
+import com.android.launcher3.util.ItemInfoMatcher;
 
 import java.util.ArrayList;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 
@@ -70,17 +72,19 @@
 
         // Update the workspace to reflect the changes to updated shortcuts residing on it.
         ArrayList<ShortcutInfo> updatedShortcutInfos = new ArrayList<>();
-        ArrayList<ShortcutInfo> deletedShortcutInfos = new ArrayList<>();
+        HashSet<ShortcutKey> removedKeys = new HashSet<>();
+
         for (ItemInfo itemInfo : dataModel.itemsIdMap) {
             if (itemInfo.itemType == LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT
                     && mUser.equals(itemInfo.user)) {
                 ShortcutInfo si = (ShortcutInfo) itemInfo;
                 if (isUserUnlocked) {
-                    ShortcutInfoCompat shortcut = pinnedShortcuts.get(ShortcutKey.fromItemInfo(si));
+                    ShortcutKey key = ShortcutKey.fromItemInfo(si);
+                    ShortcutInfoCompat shortcut = pinnedShortcuts.get(key);
                     // We couldn't verify the shortcut during loader. If its no longer available
                     // (probably due to clear data), delete the workspace item as well
                     if (shortcut == null) {
-                        deletedShortcutInfos.add(si);
+                        removedKeys.add(key);
                         continue;
                     }
                     si.isDisabled &= ~ShortcutInfo.FLAG_DISABLED_LOCKED_USER;
@@ -93,9 +97,9 @@
                 updatedShortcutInfos.add(si);
             }
         }
-        bindUpdatedShortcuts(updatedShortcutInfos, deletedShortcutInfos, mUser);
-        if (!deletedShortcutInfos.isEmpty()) {
-            getModelWriter().deleteItemsFromDatabase(deletedShortcutInfos);
+        bindUpdatedShortcuts(updatedShortcutInfos, mUser);
+        if (!removedKeys.isEmpty()) {
+            deleteAndBindComponentsRemoved(ItemInfoMatcher.ofShortcutKeys(removedKeys));
         }
 
         // Remove shortcut id map for that user
diff --git a/src/com/android/launcher3/notification/NotificationListener.java b/src/com/android/launcher3/notification/NotificationListener.java
index 6a70989..9126626 100644
--- a/src/com/android/launcher3/notification/NotificationListener.java
+++ b/src/com/android/launcher3/notification/NotificationListener.java
@@ -32,7 +32,6 @@
 import android.util.Pair;
 
 import com.android.launcher3.LauncherModel;
-import com.android.launcher3.config.FeatureFlags;
 import com.android.launcher3.util.PackageUserKey;
 import com.android.launcher3.util.SettingsObserver;
 
@@ -164,9 +163,6 @@
     }
 
     public static void setNotificationsChangedListener(NotificationsChangedListener listener) {
-        if (!FeatureFlags.BADGE_ICONS) {
-            return;
-        }
         sNotificationsChangedListener = listener;
 
         NotificationListener notificationListener = getInstanceIfConnected();
diff --git a/src/com/android/launcher3/util/ItemInfoMatcher.java b/src/com/android/launcher3/util/ItemInfoMatcher.java
index 42de284..18787b6 100644
--- a/src/com/android/launcher3/util/ItemInfoMatcher.java
+++ b/src/com/android/launcher3/util/ItemInfoMatcher.java
@@ -18,6 +18,7 @@
 
 import android.content.ComponentName;
 import android.os.UserHandle;
+import android.util.SparseLongArray;
 
 import com.android.launcher3.FolderInfo;
 import com.android.launcher3.ItemInfo;
@@ -66,6 +67,32 @@
         return filtered;
     }
 
+    /**
+     * Returns a new matcher with returns true if either this or {@param matcher} returns true.
+     */
+    public ItemInfoMatcher or(final ItemInfoMatcher matcher) {
+       final ItemInfoMatcher that = this;
+        return new ItemInfoMatcher() {
+            @Override
+            public boolean matches(ItemInfo info, ComponentName cn) {
+                return that.matches(info, cn) || matcher.matches(info, cn);
+            }
+        };
+    }
+
+    /**
+     * Returns a new matcher with returns true if both this and {@param matcher} returns true.
+     */
+    public ItemInfoMatcher and(final ItemInfoMatcher matcher) {
+        final ItemInfoMatcher that = this;
+        return new ItemInfoMatcher() {
+            @Override
+            public boolean matches(ItemInfo info, ComponentName cn) {
+                return that.matches(info, cn) && matcher.matches(info, cn);
+            }
+        };
+    }
+
     public static ItemInfoMatcher ofUser(final UserHandle user) {
         return new ItemInfoMatcher() {
             @Override
@@ -104,4 +131,14 @@
             }
         };
     }
+
+    public static ItemInfoMatcher ofItemIds(
+            final LongArrayMap<Boolean> ids, final Boolean matchDefault) {
+        return new ItemInfoMatcher() {
+            @Override
+            public boolean matches(ItemInfo info, ComponentName cn) {
+                return ids.get(info.id, matchDefault);
+            }
+        };
+    }
 }
diff --git a/src/com/android/launcher3/widget/WidgetListRowEntry.java b/src/com/android/launcher3/widget/WidgetListRowEntry.java
index 3e89eeb..335b8c7 100644
--- a/src/com/android/launcher3/widget/WidgetListRowEntry.java
+++ b/src/com/android/launcher3/widget/WidgetListRowEntry.java
@@ -41,4 +41,8 @@
         this.widgets = items;
     }
 
+    @Override
+    public String toString() {
+        return pkgItem.packageName + ":" + widgets.size();
+    }
 }
diff --git a/src/com/android/launcher3/widget/WidgetsContainerView.java b/src/com/android/launcher3/widget/WidgetsContainerView.java
index 14a9d17..acec3dd 100644
--- a/src/com/android/launcher3/widget/WidgetsContainerView.java
+++ b/src/com/android/launcher3/widget/WidgetsContainerView.java
@@ -17,10 +17,12 @@
 package com.android.launcher3.widget;
 
 import android.content.Context;
+import android.content.pm.LauncherApps;
 import android.graphics.Point;
 import android.support.v7.widget.LinearLayoutManager;
 import android.util.AttributeSet;
 import android.util.Log;
+import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Toast;
@@ -31,8 +33,10 @@
 import com.android.launcher3.DropTarget.DragObject;
 import com.android.launcher3.ItemInfo;
 import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
+import com.android.launcher3.compat.AlphabeticIndexCompat;
 import com.android.launcher3.dragndrop.DragOptions;
 import com.android.launcher3.folder.Folder;
 import com.android.launcher3.model.PackageItemInfo;
@@ -74,7 +78,11 @@
     public WidgetsContainerView(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
         mLauncher = Launcher.getLauncher(context);
-        mAdapter = new WidgetsListAdapter(this, this, context);
+        LauncherAppState apps = LauncherAppState.getInstance(context);
+        mAdapter = new WidgetsListAdapter(context, LayoutInflater.from(context),
+                apps.getWidgetCache(), new AlphabeticIndexCompat(context), this, this,
+                new WidgetsDiffReporter(apps.getIconCache()));
+        mAdapter.setNotifyListener();
         if (LOGD) {
             Log.d(TAG, "WidgetsContainerView constructor");
         }
@@ -232,7 +240,6 @@
      */
     public void setWidgets(MultiHashMap<PackageItemInfo, WidgetItem> model) {
         mAdapter.setWidgets(model);
-        mAdapter.notifyDataSetChanged();
 
         View loader = getContentView().findViewById(R.id.loader);
         if (loader != null) {
diff --git a/src/com/android/launcher3/widget/WidgetsDiffReporter.java b/src/com/android/launcher3/widget/WidgetsDiffReporter.java
new file mode 100644
index 0000000..d9c9ef9
--- /dev/null
+++ b/src/com/android/launcher3/widget/WidgetsDiffReporter.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2017 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.widget;
+
+import android.util.Log;
+
+import com.android.launcher3.IconCache;
+import com.android.launcher3.model.PackageItemInfo;
+import com.android.launcher3.widget.WidgetsListAdapter.WidgetListRowEntryComparator;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+
+/**
+ * Do diff on widget's tray list items and call the {@link NotifyListener} methods accordingly.
+ */
+public class WidgetsDiffReporter {
+    private final boolean DEBUG = true;
+    private final String TAG = "WidgetsDiffReporter";
+    private final IconCache mIconCache;
+    private NotifyListener mListener;
+
+    public interface NotifyListener {
+        void notifyDataSetChanged();
+        void notifyItemChanged(int index);
+        void notifyItemInserted(int index);
+        void notifyItemRemoved(int index);
+    }
+
+    public WidgetsDiffReporter(IconCache iconCache) {
+        mIconCache = iconCache;
+    }
+
+    public void setListener(NotifyListener listener) {
+        mListener = listener;
+    }
+
+    public void process(ArrayList<WidgetListRowEntry> currentEntries,
+            ArrayList<WidgetListRowEntry> newEntries, WidgetListRowEntryComparator comparator) {
+        if (DEBUG) {
+            Log.d(TAG, "process oldEntries#=" + currentEntries.size()
+                    + " newEntries#=" + newEntries.size());
+        }
+        if (currentEntries.size() == 0 && newEntries.size() > 0) {
+            currentEntries.addAll(newEntries);
+            mListener.notifyDataSetChanged();
+            return;
+        }
+        ArrayList<WidgetListRowEntry> orgEntries =
+                (ArrayList<WidgetListRowEntry>) currentEntries.clone();
+        Iterator<WidgetListRowEntry> orgIter = orgEntries.iterator();
+        Iterator<WidgetListRowEntry> newIter = newEntries.iterator();
+
+        WidgetListRowEntry orgRowEntry = orgIter.next();
+        WidgetListRowEntry newRowEntry = newIter.next();
+
+        do {
+            int diff = comparePackageName(orgRowEntry, newRowEntry, comparator);
+            if (DEBUG) {
+                Log.d(TAG, String.format("diff=%d orgRowEntry (%s) newRowEntry (%s)",
+                        diff, orgRowEntry != null? orgRowEntry.toString() : null,
+                        newRowEntry != null? newRowEntry.toString() : null));
+            }
+            int index = -1;
+            if (diff < 0) {
+                index = currentEntries.indexOf(orgRowEntry);
+                mListener.notifyItemRemoved(index);
+                if (DEBUG) {
+                    Log.d(TAG, String.format("notifyItemRemoved called (%d)%s", index,
+                            orgRowEntry.titleSectionName));
+                }
+                currentEntries.remove(index);
+                orgRowEntry = orgIter.hasNext() ? orgIter.next() : null;
+            } else if (diff > 0) {
+                index = orgRowEntry != null? currentEntries.indexOf(orgRowEntry):
+                        currentEntries.size();
+                currentEntries.add(index, newRowEntry);
+                newRowEntry = newIter.hasNext() ? newIter.next() : null;
+                mListener.notifyItemInserted(index);
+                if (DEBUG) {
+                    Log.d(TAG, String.format("notifyItemInserted called (%d)%s", index,
+                            newRowEntry.titleSectionName));
+                }
+            } else {
+                // same package name but,
+                // did the icon, title, etc, change?
+                // or did the widget size and desc, span, etc change?
+                if (!isSamePackageItemInfo(orgRowEntry.pkgItem, newRowEntry.pkgItem) ||
+                        !orgRowEntry.widgets.equals(newRowEntry.widgets)) {
+                    index = currentEntries.indexOf(orgRowEntry);
+                    currentEntries.set(index, newRowEntry);
+                    mListener.notifyItemChanged(index);
+                    if (DEBUG) {
+                        Log.d(TAG, String.format("notifyItemChanged called (%d)%s", index,
+                                newRowEntry.titleSectionName));
+                    }
+                }
+                orgRowEntry = orgIter.hasNext() ? orgIter.next() : null;
+                newRowEntry = newIter.hasNext() ? newIter.next() : null;
+            }
+        } while(orgRowEntry != null || newRowEntry != null);
+    }
+
+    /**
+     * Compare package name using the same comparator as in {@link WidgetsListAdapter}.
+     * Also handle null row pointers.
+     */
+    private int comparePackageName(WidgetListRowEntry curRow, WidgetListRowEntry newRow,
+            WidgetListRowEntryComparator comparator) {
+        if (curRow == null && newRow == null) {
+            throw new IllegalStateException("Cannot compare PackageItemInfo if both rows are null.");
+        }
+
+        if (curRow == null && newRow != null) {
+            return 1; // new row needs to be inserted
+        } else if (curRow != null && newRow == null) {
+            return -1; // old row needs to be deleted
+        }
+        return comparator.compare(curRow, newRow);
+    }
+
+    private boolean isSamePackageItemInfo(PackageItemInfo curInfo, PackageItemInfo newInfo) {
+        return curInfo.iconBitmap.equals(newInfo.iconBitmap) &&
+                !mIconCache.isDefaultIcon(curInfo.iconBitmap, curInfo.user);
+    }
+}
diff --git a/src/com/android/launcher3/widget/WidgetsListAdapter.java b/src/com/android/launcher3/widget/WidgetsListAdapter.java
index a1eb0ab..6b1800c 100644
--- a/src/com/android/launcher3/widget/WidgetsListAdapter.java
+++ b/src/com/android/launcher3/widget/WidgetsListAdapter.java
@@ -21,9 +21,10 @@
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.View.OnLongClickListener;
 import android.view.ViewGroup;
 
-import com.android.launcher3.LauncherAppState;
 import com.android.launcher3.R;
 import com.android.launcher3.WidgetPreviewLoader;
 import com.android.launcher3.compat.AlphabeticIndexCompat;
@@ -55,40 +56,67 @@
 
     private final WidgetPreviewLoader mWidgetPreviewLoader;
     private final LayoutInflater mLayoutInflater;
-
-    private final View.OnClickListener mIconClickListener;
-    private final View.OnLongClickListener mIconLongClickListener;
-
-    private final ArrayList<WidgetListRowEntry> mEntries = new ArrayList<>();
     private final AlphabeticIndexCompat mIndexer;
 
+    private final OnClickListener mIconClickListener;
+    private final OnLongClickListener mIconLongClickListener;
     private final int mIndent;
+    private ArrayList<WidgetListRowEntry> mEntries = new ArrayList<>();
+    private final WidgetsDiffReporter mDiffReporter;
 
-    public WidgetsListAdapter(View.OnClickListener iconClickListener,
-            View.OnLongClickListener iconLongClickListener,
-            Context context) {
-        mLayoutInflater = LayoutInflater.from(context);
-        mWidgetPreviewLoader = LauncherAppState.getInstance(context).getWidgetCache();
-
-        mIndexer = new AlphabeticIndexCompat(context);
-
+    public WidgetsListAdapter(Context context, LayoutInflater layoutInflater,
+            WidgetPreviewLoader widgetPreviewLoader, AlphabeticIndexCompat indexCompat,
+            OnClickListener iconClickListener, OnLongClickListener iconLongClickListener,
+            WidgetsDiffReporter diffReporter) {
+        mLayoutInflater = layoutInflater;
+        mWidgetPreviewLoader = widgetPreviewLoader;
+        mIndexer = indexCompat;
         mIconClickListener = iconClickListener;
         mIconLongClickListener = iconLongClickListener;
         mIndent = context.getResources().getDimensionPixelSize(R.dimen.widget_section_indent);
+        mDiffReporter = diffReporter;
     }
 
-    public void setWidgets(MultiHashMap<PackageItemInfo, WidgetItem> widgets) {
-        mEntries.clear();
-        WidgetItemComparator widgetComparator = new WidgetItemComparator();
+    public void setNotifyListener() {
+        mDiffReporter.setListener(new WidgetsDiffReporter.NotifyListener() {
+            @Override
+            public void notifyDataSetChanged() {
+                WidgetsListAdapter.this.notifyDataSetChanged();
+            }
 
+            @Override
+            public void notifyItemChanged(int index) {
+                WidgetsListAdapter.this.notifyItemChanged(index);
+            }
+
+            @Override
+            public void notifyItemInserted(int index) {
+                WidgetsListAdapter.this.notifyItemInserted(index);
+            }
+
+            @Override
+            public void notifyItemRemoved(int index) {
+                WidgetsListAdapter.this.notifyItemRemoved(index);
+            }
+        });
+    }
+
+    /**
+     * Update the widget list.
+     */
+    public void setWidgets(MultiHashMap<PackageItemInfo, WidgetItem> widgets) {
+        ArrayList<WidgetListRowEntry> tempEntries = new ArrayList<>();
+
+        WidgetItemComparator widgetComparator = new WidgetItemComparator();
         for (Map.Entry<PackageItemInfo, ArrayList<WidgetItem>> entry : widgets.entrySet()) {
             WidgetListRowEntry row = new WidgetListRowEntry(entry.getKey(), entry.getValue());
             row.titleSectionName = mIndexer.computeSectionName(row.pkgItem.title);
             Collections.sort(row.widgets, widgetComparator);
-            mEntries.add(row);
+            tempEntries.add(row);
         }
-
-        Collections.sort(mEntries, new WidgetListRowEntryComparator());
+        WidgetListRowEntryComparator rowComparator = new WidgetListRowEntryComparator();
+        Collections.sort(tempEntries, rowComparator);
+        mDiffReporter.process(mEntries, tempEntries, rowComparator);
     }
 
     @Override
diff --git a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
index 7fb5d85..1be33d2 100644
--- a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
+++ b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
@@ -103,7 +103,7 @@
      */
     protected UiObject2 openAllApps() {
         mDevice.waitForIdle();
-        if (FeatureFlags.LAUNCHER3_ALL_APPS_PULL_UP) {
+        if (FeatureFlags.NO_ALL_APPS_ICON) {
             // clicking on the page indicator brings up all apps tray on non tablets.
             findViewById(R.id.page_indicator).click();
         } else {
diff --git a/tests/src/com/android/launcher3/widget/WidgetsListAdapterTest.java b/tests/src/com/android/launcher3/widget/WidgetsListAdapterTest.java
new file mode 100644
index 0000000..40b65e4
--- /dev/null
+++ b/tests/src/com/android/launcher3/widget/WidgetsListAdapterTest.java
@@ -0,0 +1,149 @@
+/*
+ * Copyright (C) 2017 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.widget;
+
+import android.appwidget.AppWidgetProviderInfo;
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.Bitmap;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.SmallTest;
+import android.support.test.runner.AndroidJUnit4;
+import android.view.LayoutInflater;
+
+import com.android.launcher3.IconCache;
+import com.android.launcher3.InvariantDeviceProfile;
+import com.android.launcher3.LauncherAppWidgetProviderInfo;
+import com.android.launcher3.WidgetPreviewLoader;
+import com.android.launcher3.compat.AlphabeticIndexCompat;
+import com.android.launcher3.compat.AppWidgetManagerCompat;
+import com.android.launcher3.model.PackageItemInfo;
+import com.android.launcher3.model.WidgetItem;
+import com.android.launcher3.util.MultiHashMap;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Matchers.anyInt;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class WidgetsListAdapterTest {
+
+    private final String TAG = "WidgetsListAdapterTest";
+
+    @Mock private LayoutInflater mMockLayoutInflater;
+    @Mock private WidgetPreviewLoader mMockWidgetCache;
+    @Mock private WidgetsDiffReporter.NotifyListener mListener;
+    @Mock private IconCache mIconCache;
+
+    private WidgetsListAdapter mAdapter;
+    private AlphabeticIndexCompat mIndexCompat;
+    private InvariantDeviceProfile mTestProfile;
+    private Context mContext;
+
+    @Before
+    public void setup() {
+        MockitoAnnotations.initMocks(this);
+        mContext = InstrumentationRegistry.getTargetContext();
+        mTestProfile = new InvariantDeviceProfile();
+        mTestProfile.numRows = 5;
+        mTestProfile.numColumns = 5;
+        mIndexCompat = new AlphabeticIndexCompat(mContext);
+        WidgetsDiffReporter reporter = new WidgetsDiffReporter(mIconCache);
+        reporter.setListener(mListener);
+        mAdapter = new WidgetsListAdapter(mContext, mMockLayoutInflater, mMockWidgetCache,
+                mIndexCompat, null, null, reporter);
+    }
+
+    @Test
+    public void test_notifyDataSetChanged() throws Exception {
+        mAdapter.setWidgets(generateSampleMap(1));
+        verify(mListener, times(1)).notifyDataSetChanged();
+    }
+
+    @Test
+    public void test_notifyItemInserted() throws Exception {
+        mAdapter.setWidgets(generateSampleMap(1));
+        mAdapter.setWidgets(generateSampleMap(2));
+        verify(mListener, times(1)).notifyDataSetChanged();
+        verify(mListener, times(1)).notifyItemInserted(1);
+    }
+
+    @Test
+    public void test_notifyItemRemoved() throws Exception {
+        mAdapter.setWidgets(generateSampleMap(2));
+        mAdapter.setWidgets(generateSampleMap(1));
+        verify(mListener, times(1)).notifyDataSetChanged();
+        verify(mListener, times(1)).notifyItemRemoved(1);
+    }
+
+    @Test
+    public void testNotifyItemChanged_PackageIconDiff() throws Exception {
+        mAdapter.setWidgets(generateSampleMap(1));
+        mAdapter.setWidgets(generateSampleMap(1));
+        verify(mListener, times(1)).notifyDataSetChanged();
+        verify(mListener, times(1)).notifyItemChanged(0);
+    }
+
+    @Test
+    public void testNotifyItemChanged_widgetItemInfoDiff() throws Exception {
+        // TODO: same package name but item number changed
+    }
+
+    @Test
+    public void testNotifyItemInsertedRemoved_hodgepodge() throws Exception {
+        // TODO: insert and remove combined.          curMap
+        // newMap [A, C, D]                           [A, B, E]
+        // B - C < 0, removed B from index 1          [A, E]
+        // E - C > 0, C inserted to index 1           [A, C, E]
+        // E - D > 0, D inserted to index 2           [A, C, D, E]
+        // E - null = -1, E deleted from index 3      [A, C, D]
+    }
+
+    /**
+     * Helper method to generate the sample widget model map that can be used for the tests
+     * @param num the number of WidgetItem the map should contain
+     * @return
+     */
+    private MultiHashMap<PackageItemInfo, WidgetItem> generateSampleMap(int num) {
+        MultiHashMap<PackageItemInfo, WidgetItem> newMap = new MultiHashMap();
+        if (num <= 0) return newMap;
+
+        PackageManager pm = mContext.getPackageManager();
+        AppWidgetManagerCompat widgetManager = AppWidgetManagerCompat.getInstance(mContext);
+        for (AppWidgetProviderInfo widgetInfo : widgetManager.getAllProviders(null)) {
+            WidgetItem wi = new WidgetItem(LauncherAppWidgetProviderInfo
+                    .fromProviderInfo(mContext, widgetInfo), pm, mTestProfile);
+
+            PackageItemInfo pInfo = new PackageItemInfo(wi.componentName.getPackageName());
+            pInfo.title = pInfo.packageName;
+            pInfo.user = wi.user;
+            pInfo.iconBitmap = Bitmap.createBitmap(10, 10, Bitmap.Config.ALPHA_8);
+            newMap.addToList(pInfo, wi);
+            if (newMap.size() == num) {
+                break;
+            }
+        }
+        return newMap;
+    }
+}