Filter recents view instances by package name

Filter instances of GroupTasks based on package name
as a part of support for multi-instance

Add a feature flag to toggle multi-instance features

See the video below for how to use the demo.
Note: some extra UI elements were added since video
was recorded, but the filtering process is the same.
http://recall/-/da585DRwKRZK3S2xxcQrSm/gW9HZnbCvGyH1DQiVizOW2

See go/multi-instance for more info about the feature

Bug: 253520408

Test: manually tested the instance filtering

Change-Id: I19c947ca353699096388b9fbbdca6d75cb0041a7
diff --git a/quickstep/res/layout/task.xml b/quickstep/res/layout/task.xml
index 7e5b85c..02a439d 100644
--- a/quickstep/res/layout/task.xml
+++ b/quickstep/res/layout/task.xml
@@ -28,6 +28,17 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
 
+    <ImageView
+        android:id="@+id/show_windows"
+        android:layout_height="@dimen/recents_filter_icon_size"
+        android:layout_width="@dimen/recents_filter_icon_size"
+        android:layout_gravity="end"
+        android:visibility="gone"
+        android:tint="@color/recents_filter_icon"
+        android:contentDescription="@string/recents_filter_icon_desc"
+        android:importantForAccessibility="no"
+        android:src="@drawable/ic_select_windows" />
+
     <com.android.quickstep.views.IconView
         android:id="@+id/icon"
         android:layout_width="@dimen/task_thumbnail_icon_size"
diff --git a/quickstep/res/layout/task_grouped.xml b/quickstep/res/layout/task_grouped.xml
index cd5bcbd..7792801 100644
--- a/quickstep/res/layout/task_grouped.xml
+++ b/quickstep/res/layout/task_grouped.xml
@@ -38,6 +38,28 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"/>
 
+    <ImageView
+        android:id="@+id/show_windows"
+        android:layout_height="@dimen/recents_filter_icon_size"
+        android:layout_width="@dimen/recents_filter_icon_size"
+        android:layout_gravity="start"
+        android:visibility="gone"
+        android:tint="@color/recents_filter_icon"
+        android:contentDescription="@string/recents_filter_icon_desc"
+        android:importantForAccessibility="no"
+        android:src="@drawable/ic_select_windows" />
+
+    <ImageView
+        android:id="@+id/show_windows_right"
+        android:layout_height="@dimen/recents_filter_icon_size"
+        android:layout_width="@dimen/recents_filter_icon_size"
+        android:layout_gravity="end"
+        android:visibility="gone"
+        android:tint="@color/recents_filter_icon"
+        android:contentDescription="@string/recents_filter_icon_desc"
+        android:importantForAccessibility="no"
+        android:src="@drawable/ic_select_windows" />
+
     <com.android.quickstep.views.IconView
         android:id="@+id/icon"
         android:layout_width="@dimen/task_thumbnail_icon_size"
diff --git a/quickstep/res/values/colors.xml b/quickstep/res/values/colors.xml
index 185c815..f63997b 100644
--- a/quickstep/res/values/colors.xml
+++ b/quickstep/res/values/colors.xml
@@ -76,4 +76,7 @@
 
     <color name="all_set_page_background">#FFFFFFFF</color>
 
+    <!-- Recents overview -->
+    <color name="recents_filter_icon">#333333</color>
+
 </resources>
\ No newline at end of file
diff --git a/quickstep/res/values/dimens.xml b/quickstep/res/values/dimens.xml
index ad77768..403d6bd 100644
--- a/quickstep/res/values/dimens.xml
+++ b/quickstep/res/values/dimens.xml
@@ -306,6 +306,9 @@
     <dimen name="taskbar_button_margin_6_5">75dp</dimen>
     <dimen name="taskbar_button_margin_default">48dp</dimen>
 
+    <!-- Recents overview -->
+    <dimen name="recents_filter_icon_size">30dp</dimen>
+
     <!-- Launcher splash screen -->
     <!-- Note: keep this value in sync with the WindowManager/Shell dimens.xml -->
     <!--     starting_surface_exit_animation_window_shift_length -->
diff --git a/quickstep/res/values/strings.xml b/quickstep/res/values/strings.xml
index 801ba26..e691522 100644
--- a/quickstep/res/values/strings.xml
+++ b/quickstep/res/values/strings.xml
@@ -36,6 +36,13 @@
     <!-- Recents: Title of a button that clears the task list, i.e. closes all tasks. [CHAR LIMIT=30] -->
     <string name="recents_clear_all">Clear all</string>
 
+    <!-- Recents: Title of a button that goes back from displaying tasks filtered by package name to displaying all tasks [CHAR LIMIT=30] -->
+    <string name="recents_back" translatable="false">Back</string>
+
+    <!-- TODO: b/260610444. Content description of filtering icons needs to be updated -->
+    <!-- Recents: Content description for the icon on top of taskviews to initiate filtering -->
+    <string name="recents_filter_icon_desc" translatable="false">Click to show only this app\'s tasks</string>
+
     <!-- Accessibility title for the list of recent apps [CHAR_LIMIT=none] -->
     <string name="accessibility_recent_apps">Recent apps</string>
 
diff --git a/quickstep/src/com/android/quickstep/RecentTasksList.java b/quickstep/src/com/android/quickstep/RecentTasksList.java
index d46565b..b33ceca 100644
--- a/quickstep/src/com/android/quickstep/RecentTasksList.java
+++ b/quickstep/src/com/android/quickstep/RecentTasksList.java
@@ -45,6 +45,8 @@
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.function.Consumer;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
 
 /**
  * Manages the recent task list from the system, caching it as necessary.
@@ -129,14 +131,18 @@
      * @return The change id of the current task list
      */
     public synchronized int getTasks(boolean loadKeysOnly,
-            Consumer<ArrayList<GroupTask>> callback) {
+            Consumer<ArrayList<GroupTask>> callback, Predicate<GroupTask> filter) {
         final int requestLoadId = mChangeId;
         if (mResultsUi.isValidForRequest(requestLoadId, loadKeysOnly)) {
             // The list is up to date, send the callback on the next frame,
             // so that requestID can be returned first.
             if (callback != null) {
                 // Copy synchronously as the changeId might change by next frame
-                ArrayList<GroupTask> result = copyOf(mResultsUi);
+                // and filter GroupTasks
+                ArrayList<GroupTask> result = mResultsUi.stream().filter(filter)
+                        .map(GroupTask::copy)
+                        .collect(Collectors.toCollection(ArrayList<GroupTask>::new));
+
                 mMainThreadExecutor.post(() -> {
                     callback.accept(result);
                 });
@@ -156,7 +162,11 @@
                 mLoadingTasksInBackground = false;
                 mResultsUi = loadResult;
                 if (callback != null) {
-                    ArrayList<GroupTask> result = copyOf(mResultsUi);
+                    // filter the tasks if needed before passing them into the callback
+                    ArrayList<GroupTask> result = mResultsUi.stream().filter(filter)
+                            .map(GroupTask::copy)
+                            .collect(Collectors.toCollection(ArrayList<GroupTask>::new));
+
                     callback.accept(result);
                 }
             });
diff --git a/quickstep/src/com/android/quickstep/RecentsFilterState.java b/quickstep/src/com/android/quickstep/RecentsFilterState.java
new file mode 100644
index 0000000..ff6951d
--- /dev/null
+++ b/quickstep/src/com/android/quickstep/RecentsFilterState.java
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2022 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.quickstep;
+
+import androidx.annotation.Nullable;
+
+import com.android.quickstep.util.GroupTask;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Predicate;
+
+/**
+ * Keeps track of the state of {@code RecentsView}.
+ *
+ * <p> More specifically, used for keeping track of the state of filters applied on tasks
+ * in {@code RecentsView} for multi-instance management.
+ */
+public class RecentsFilterState {
+    // the minimum number of tasks per package present to allow filtering
+    public static final int MIN_FILTERING_TASK_COUNT = 2;
+
+    // default filter that returns true for any input
+    public static final Predicate<GroupTask> DEFAULT_FILTER = (groupTask -> true);
+
+    // the package name to filter recent tasks by
+    @Nullable
+    private String mPackageNameToFilter = null;
+
+    // the callback that gets executed upon filter change
+    @Nullable
+    private Runnable mOnFilterUpdatedListener = null;
+
+    // map maintaining the count for each unique base activity package name currently in the recents
+    @Nullable
+    private Map<String, Integer> mInstanceCountMap;
+
+    /**
+     * Returns {@code true} if {@code RecentsView} filters tasks by some package name.
+     */
+    public boolean isFiltered() {
+        return mPackageNameToFilter != null;
+    }
+
+    /**
+     * Returns the package name that tasks are filtered by.
+     */
+    @Nullable
+    public String getPackageNameToFilter() {
+        return mPackageNameToFilter;
+    }
+
+
+    /**
+     * Sets a listener on any changes to the filter.
+     *
+     * @param callback listener to be executed upon filter updates
+     */
+    public void setOnFilterUpdatedListener(@Nullable Runnable callback) {
+        mOnFilterUpdatedListener = callback;
+    }
+
+    /**
+     * Updates the filter such that tasks are filtered by a certain package name.
+     *
+     * @param packageName package name of the base activity to filter tasks by;
+     *                    if null, filter is turned off
+     */
+    public void setFilterBy(@Nullable String packageName) {
+        if (Objects.equals(packageName, mPackageNameToFilter)) {
+            return;
+        }
+
+        mPackageNameToFilter = packageName;
+
+        if (mOnFilterUpdatedListener != null) {
+            mOnFilterUpdatedListener.run();
+        }
+    }
+
+    /**
+     * Updates the map of package names to their count in the most recent list of tasks.
+     *
+     * @param groupTaskList the list of tasks that map update is be based on
+     */
+    public void updateInstanceCountMap(List<GroupTask> groupTaskList) {
+        mInstanceCountMap = getInstanceCountMap(groupTaskList);
+    }
+
+    /**
+     * Returns the map of package names to their count in the most recent list of tasks.
+     */
+    @Nullable
+    public Map<String, Integer> getInstanceCountMap() {
+        return mInstanceCountMap;
+    }
+
+    /**
+     * Returns a predicate for filtering out GroupTasks by package name.
+     *
+     * @param packageName package name to filter GroupTasks by
+     *                    if null, Predicate always returns true.
+     */
+    public static Predicate<GroupTask> getFilter(@Nullable String packageName) {
+        if (packageName == null) {
+            return DEFAULT_FILTER;
+        }
+
+        return (groupTask) -> (groupTask.task2 != null
+                && groupTask.task2.key.getPackageName().equals(packageName))
+                || groupTask.task1.key.getPackageName().equals(packageName);
+    }
+
+    /**
+     * Returns a map of package names to their frequencies in a list of GroupTasks.
+     *
+     * @param groupTasks the list to go through to create the map
+     */
+    public static Map<String, Integer> getInstanceCountMap(List<GroupTask> groupTasks) {
+        Map<String, Integer> instanceCountMap = new HashMap<>();
+
+        for (GroupTask groupTask : groupTasks) {
+            final String firstTaskPkgName = groupTask.task1.key.getPackageName();
+            final String secondTaskPkgName =
+                    groupTask.task2 == null ? null : groupTask.task2.key.getPackageName();
+
+            // increment the instance count for the first task's base activity package name
+            incrementOrAddIfNotExists(instanceCountMap, firstTaskPkgName);
+
+            // check if second task is non existent
+            if (secondTaskPkgName != null) {
+                // increment the instance count for the second task's base activity package name
+                incrementOrAddIfNotExists(instanceCountMap, secondTaskPkgName);
+            }
+        }
+
+        return instanceCountMap;
+    }
+
+    /**
+     * Returns true if tasks of provided package name should show filter UI.
+     *
+     * @param taskPackageName package name of the task in question
+     */
+    public boolean shouldShowFilterUI(String taskPackageName) {
+        // number of occurrences in recents overview with the package name of this task
+        int instanceCount = getInstanceCountMap().get(taskPackageName);
+
+        // if the number of occurrences isn't enough make sure tasks can't be filtered by
+        // the package name of this task
+        return !(isFiltered() || instanceCount < MIN_FILTERING_TASK_COUNT);
+    }
+
+    private static void incrementOrAddIfNotExists(Map<String, Integer> map, String pkgName) {
+        if (!map.containsKey(pkgName)) {
+            map.put(pkgName, 0);
+        }
+        map.put(pkgName, map.get(pkgName) + 1);
+    }
+}
diff --git a/quickstep/src/com/android/quickstep/RecentsModel.java b/quickstep/src/com/android/quickstep/RecentsModel.java
index 3d6da8e..913f08f 100644
--- a/quickstep/src/com/android/quickstep/RecentsModel.java
+++ b/quickstep/src/com/android/quickstep/RecentsModel.java
@@ -50,6 +50,7 @@
 import java.util.concurrent.Executor;
 import java.util.concurrent.Executors;
 import java.util.function.Consumer;
+import java.util.function.Predicate;
 
 /**
  * Singleton class to load and manage recents model.
@@ -104,7 +105,22 @@
      * @return the request id associated with this call.
      */
     public int getTasks(Consumer<ArrayList<GroupTask>> callback) {
-        return mTaskList.getTasks(false /* loadKeysOnly */, callback);
+        return mTaskList.getTasks(false /* loadKeysOnly */, callback,
+                RecentsFilterState.DEFAULT_FILTER);
+    }
+
+
+    /**
+     * Fetches the list of recent tasks, based on a filter
+     *
+     * @param callback The callback to receive the task plan once its complete or null. This is
+     *                always called on the UI thread.
+     * @param filter  Returns true if a GroupTask should be included into the list passed into
+     *                callback.
+     * @return the request id associated with this call.
+     */
+    public int getTasks(Consumer<ArrayList<GroupTask>> callback, Predicate<GroupTask> filter) {
+        return mTaskList.getTasks(false /* loadKeysOnly */, callback, filter);
     }
 
     /**
@@ -126,8 +142,9 @@
      * Checks if a task has been removed or not.
      *
      * @param callback Receives true if task is removed, false otherwise
+     * @param filter Returns true if GroupTask should be in the list of considerations
      */
-    public void isTaskRemoved(int taskId, Consumer<Boolean> callback) {
+    public void isTaskRemoved(int taskId, Consumer<Boolean> callback, Predicate<GroupTask> filter) {
         mTaskList.getTasks(true /* loadKeysOnly */, (taskGroups) -> {
             for (GroupTask group : taskGroups) {
                 if (group.containsTask(taskId)) {
@@ -136,7 +153,7 @@
                 }
             }
             callback.accept(true);
-        });
+        }, filter);
     }
 
     @Override
diff --git a/quickstep/src/com/android/quickstep/views/GroupedTaskView.java b/quickstep/src/com/android/quickstep/views/GroupedTaskView.java
index 2cada0a..3f7d677 100644
--- a/quickstep/src/com/android/quickstep/views/GroupedTaskView.java
+++ b/quickstep/src/com/android/quickstep/views/GroupedTaskView.java
@@ -2,7 +2,6 @@
 
 import static com.android.launcher3.util.SplitConfigurationOptions.DEFAULT_SPLIT_RATIO;
 import static com.android.launcher3.util.SplitConfigurationOptions.STAGE_POSITION_BOTTOM_OR_RIGHT;
-import static com.android.launcher3.util.SplitConfigurationOptions.STAGE_POSITION_TOP_OR_LEFT;
 
 import android.content.Context;
 import android.graphics.PointF;
@@ -102,6 +101,22 @@
                 PreviewPositionHelper.STAGE_POSITION_BOTTOM_OR_RIGHT);
     }
 
+    /**
+     * Sets up an on-click listener and the visibility for show_windows icon on top of each task.
+     */
+    @Override
+    public void setUpShowAllInstancesListener() {
+        // sets up the listener for the left/top task
+        super.setUpShowAllInstancesListener();
+
+        // right/bottom task's base package name
+        String taskPackageName = mTaskIdAttributeContainer[1].getTask().key.getPackageName();
+
+        // icon of the right/bottom task
+        View showWindowsView = findViewById(R.id.show_windows_right);
+        updateFilterCallback(showWindowsView, getFilterUpdateCallback(taskPackageName));
+    }
+
     @Override
     public void onTaskListVisibilityChanged(boolean visible, int changes) {
         super.onTaskListVisibilityChanged(visible, changes);
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index 3a2841e..971eda5 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -164,6 +164,7 @@
 import com.android.quickstep.GestureState;
 import com.android.quickstep.RecentsAnimationController;
 import com.android.quickstep.RecentsAnimationTargets;
+import com.android.quickstep.RecentsFilterState;
 import com.android.quickstep.RecentsModel;
 import com.android.quickstep.RemoteAnimationTargets;
 import com.android.quickstep.RemoteTargetGluer;
@@ -580,7 +581,7 @@
                                 if (taskRemoved) {
                                     dismissTask(taskId);
                                 }
-                            });
+                            }, RecentsFilterState.getFilter(mFilterState.getPackageNameToFilter()));
                         }
                     }));
         }
@@ -721,6 +722,9 @@
     @Nullable
     private TaskLaunchListener mTaskLaunchListener;
 
+    // keeps track of the state of the filter for tasks in recents view
+    private final RecentsFilterState mFilterState = new RecentsFilterState();
+
     public RecentsView(Context context, @Nullable AttributeSet attrs, int defStyleAttr,
             BaseActivityInterface sizeStrategy) {
         super(context, attrs, defStyleAttr);
@@ -784,6 +788,55 @@
         mActivity.getViewCache().setCacheSize(R.layout.digital_wellbeing_toast, 5);
 
         mTintingColor = getForegroundScrimDimColor(context);
+
+        // if multi-instance feature is enabled
+        if (FeatureFlags.ENABLE_MULTI_INSTANCE.get()) {
+            // invalidate the current list of tasks if filter changes
+            mFilterState.setOnFilterUpdatedListener(this::invalidateTaskList);
+        }
+        // make sure filter is turned off by default
+        mFilterState.setFilterBy(null);
+    }
+
+    /** Get the state of the filter */
+    public RecentsFilterState getFilterState() {
+        return mFilterState;
+    }
+
+    /**
+     * Toggles the filter and reloads the recents view if needed.
+     *
+     * @param packageName package name to filter by if the filter is being turned on;
+     *                    should be null if filter is being turned off
+     */
+    public void setAndApplyFilter(@Nullable String packageName) {
+        mFilterState.setFilterBy(packageName);
+        updateClearAllFunction();
+        reloadIfNeeded();
+    }
+
+    /**
+     * Updates the "Clear All" button and its function depending on the recents view state.
+     *
+     * TODO: add a different button for going back to overview. Present solution is for demo only.
+     */
+    public void updateClearAllFunction() {
+        if (mFilterState.isFiltered()) {
+            mClearAllButton.setText(R.string.recents_back);
+            mClearAllButton.setOnClickListener((view) -> {
+                this.setAndApplyFilter(null);
+            });
+        } else {
+            mClearAllButton.setText(R.string.recents_clear_all);
+            mClearAllButton.setOnClickListener(this::dismissAllTasks);
+        }
+    }
+
+    /**
+     * Invalidates the list of tasks so that an update occurs to the list of tasks if requested.
+     */
+    private void invalidateTaskList() {
+        mTaskListChangeId = -1;
     }
 
     public OverScroller getScroller() {
@@ -1546,6 +1599,9 @@
         Task stagedTaskToBeRemovedFromGrid =
                 mSplitSelectSource != null ? mSplitSelectSource.alreadyRunningTask : null;
 
+        // update the map of instance counts
+        mFilterState.updateInstanceCountMap(taskGroups);
+
         // Add views as children based on whether it's grouped or single task. Looping through
         // taskGroups backwards populates the thumbnail grid from least recent to most recent.
         for (int i = taskGroups.size() - 1; i >= 0; i--) {
@@ -1580,6 +1636,7 @@
                         groupTask.mSplitBounds.leftTopTaskId == groupTask.task1.key.id;
                 Task leftTopTask = firstTaskIsLeftTopTask ? groupTask.task1 : groupTask.task2;
                 Task rightBottomTask = firstTaskIsLeftTopTask ? groupTask.task2 : groupTask.task1;
+
                 ((GroupedTaskView) taskView).bind(leftTopTask, rightBottomTask, mOrientationState,
                         groupTask.mSplitBounds);
             } else if (taskView instanceof DesktopTaskView) {
@@ -1588,6 +1645,11 @@
             } else {
                 taskView.bind(groupTask.task1, mOrientationState);
             }
+
+            // enables instance filtering if the feature flag for it is on
+            if (FeatureFlags.ENABLE_MULTI_INSTANCE.get()) {
+                taskView.setUpShowAllInstancesListener();
+            }
         }
 
         if (!taskGroups.isEmpty()) {
@@ -2257,7 +2319,8 @@
      */
     public void reloadIfNeeded() {
         if (!mModel.isTaskListValid(mTaskListChangeId)) {
-            mTaskListChangeId = mModel.getTasks(this::applyLoadPlan);
+            mTaskListChangeId = mModel.getTasks(this::applyLoadPlan, RecentsFilterState
+                    .getFilter(mFilterState.getPackageNameToFilter()));
         }
     }
 
diff --git a/quickstep/src/com/android/quickstep/views/TaskView.java b/quickstep/src/com/android/quickstep/views/TaskView.java
index bda30a5..1d9e05f 100644
--- a/quickstep/src/com/android/quickstep/views/TaskView.java
+++ b/quickstep/src/com/android/quickstep/views/TaskView.java
@@ -526,6 +526,50 @@
         setOrientationState(orientedState);
     }
 
+    /**
+     * Sets up an on-click listener and the visibility for show_windows icon on top of the task.
+     */
+    public void setUpShowAllInstancesListener() {
+        String taskPackageName = mTaskIdAttributeContainer[0].mTask.key.getPackageName();
+
+        // icon of the top/left task
+        View showWindowsView = findViewById(R.id.show_windows);
+        updateFilterCallback(showWindowsView, getFilterUpdateCallback(taskPackageName));
+    }
+
+    /**
+     * Returns a callback that updates the state of the filter and the recents overview
+     *
+     * @param taskPackageName package name of the task to filter by
+     */
+    @Nullable
+    protected View.OnClickListener getFilterUpdateCallback(String taskPackageName) {
+        View.OnClickListener cb = (view) -> {
+            // update and apply a new filter
+            getRecentsView().setAndApplyFilter(taskPackageName);
+        };
+
+        if (!getRecentsView().getFilterState().shouldShowFilterUI(taskPackageName)) {
+            cb = null;
+        }
+        return cb;
+    }
+
+    /**
+     * Sets the correct visibility and callback on the provided filterView based on whether
+     * the callback is null or not
+     */
+    protected void updateFilterCallback(@NonNull View filterView,
+            @Nullable View.OnClickListener callback) {
+        if (callback == null) {
+            filterView.setVisibility(GONE);
+        } else {
+            filterView.setVisibility(VISIBLE);
+        }
+
+        filterView.setOnClickListener(callback);
+    }
+
     public TaskIdAttributeContainer[] getTaskIdAttributeContainers() {
         return mTaskIdAttributeContainer;
     }
diff --git a/res/drawable/ic_select_windows.xml b/res/drawable/ic_select_windows.xml
new file mode 100644
index 0000000..cba0fde
--- /dev/null
+++ b/res/drawable/ic_select_windows.xml
@@ -0,0 +1,26 @@
+<!--
+  ~ Copyright (C) 2022 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.
+  -->
+
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="48"
+    android:viewportHeight="48"
+    android:tint="?attr/colorControlNormal">
+  <path
+      android:fillColor="@android:color/white"
+      android:pathData="M7,44Q5.8,44 4.9,43.1Q4,42.2 4,41V21.65Q4,20.45 4.9,19.55Q5.8,18.65 7,18.65H12.75V7Q12.75,5.8 13.65,4.9Q14.55,4 15.75,4H41Q42.2,4 43.1,4.9Q44,5.8 44,7V26.35Q44,27.55 43.1,28.45Q42.2,29.35 41,29.35H35.3V41Q35.3,42.2 34.4,43.1Q33.5,44 32.3,44ZM7,41H32.3Q32.3,41 32.3,41Q32.3,41 32.3,41V24.65H7V41Q7,41 7,41Q7,41 7,41ZM35.3,26.35H41Q41,26.35 41,26.35Q41,26.35 41,26.35V10H15.75V18.65H31.6Q33.2,18.65 34.25,19.7Q35.3,20.75 35.3,22.35Z"/>
+</vector>
\ No newline at end of file
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index b46e43f..082f6a1 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -377,6 +377,10 @@
             "ENABLE_TASKBAR_EDU_TOOLTIP", false,
             "Enable the tooltip version of the Taskbar education flow.");
 
+    public static final BooleanFlag ENABLE_MULTI_INSTANCE = getDebugFlag(
+            "ENABLE_MULTI_INSTANCE", false,
+            "Enables creation and filtering of multiple task instances in overview");
+
     public static void initialize(Context context) {
         synchronized (sDebugFlags) {
             for (DebugFlag flag : sDebugFlags) {