diff --git a/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java b/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
index 6249e6a..42c89fd 100644
--- a/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
+++ b/quickstep/src/com/android/quickstep/AbsSwipeUpHandler.java
@@ -1534,7 +1534,9 @@
         boolean wasVisible = mWasLauncherAlreadyVisible || mGestureStarted;
         mActivityInterface.onTransitionCancelled(wasVisible, mGestureState.getEndTarget());
 
-        TaskViewUtils.setDividerBarShown(mRecentsAnimationTargets.nonApps, true);
+        if (mRecentsAnimationTargets != null) {
+            TaskViewUtils.setDividerBarShown(mRecentsAnimationTargets.nonApps, true);
+        }
 
         // Leave the pending invisible flag, as it may be used by wallpaper open animation.
         if (mActivity != null) {
diff --git a/quickstep/src/com/android/quickstep/TaskOverlayFactory.java b/quickstep/src/com/android/quickstep/TaskOverlayFactory.java
index 080533b..f49c9b0 100644
--- a/quickstep/src/com/android/quickstep/TaskOverlayFactory.java
+++ b/quickstep/src/com/android/quickstep/TaskOverlayFactory.java
@@ -183,6 +183,13 @@
         }
 
         /**
+         * Called when the current task's thumbnail has changed.
+         */
+        public void refreshActionVisibility(ThumbnailData thumbnail) {
+            getActionsView().updateDisabledFlags(DISABLED_NO_THUMBNAIL, thumbnail == null);
+        }
+
+        /**
          * End rendering live tile in Overview.
          *
          * @param callback callback to run, after switching to screenshot
diff --git a/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java b/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java
index ac2534e..65be624 100644
--- a/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java
+++ b/quickstep/src/com/android/quickstep/util/MotionPauseDetector.java
@@ -17,6 +17,7 @@
 
 import android.content.Context;
 import android.content.res.Resources;
+import android.util.Log;
 import android.view.MotionEvent;
 import android.view.VelocityTracker;
 
@@ -85,7 +86,12 @@
         mSpeedSomewhatFast = res.getDimension(R.dimen.motion_pause_detector_speed_somewhat_fast);
         mSpeedFast = res.getDimension(R.dimen.motion_pause_detector_speed_fast);
         mForcePauseTimeout = new Alarm();
-        mForcePauseTimeout.setOnAlarmListener(alarm -> updatePaused(true /* isPaused */));
+        mForcePauseTimeout.setOnAlarmListener(alarm -> {
+            if (TestProtocol.sDebugTracing) {
+                Log.d(TestProtocol.MOTION_PAUSE_TIMEOUT, "onAlarm");
+            }
+            updatePaused(true /* isPaused */);
+        });
         mMakePauseHarderToTrigger = makePauseHarderToTrigger;
         mVelocityProvider = new SystemVelocityProvider(axis);
     }
@@ -119,9 +125,13 @@
      * @param pointerIndex Index for the pointer being tracked in the motion event
      */
     public void addPosition(MotionEvent ev, int pointerIndex) {
-        mForcePauseTimeout.setAlarm(TestProtocol.sForcePauseTimeout != null
+        long timeoutMs = TestProtocol.sForcePauseTimeout != null
                 ? TestProtocol.sForcePauseTimeout
-                : mMakePauseHarderToTrigger ? HARDER_TRIGGER_TIMEOUT : FORCE_PAUSE_TIMEOUT);
+                : mMakePauseHarderToTrigger ? HARDER_TRIGGER_TIMEOUT : FORCE_PAUSE_TIMEOUT;
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.MOTION_PAUSE_TIMEOUT, "setAlarm: " + timeoutMs);
+        }
+        mForcePauseTimeout.setAlarm(timeoutMs);
         float newVelocity = mVelocityProvider.addMotionEvent(ev, ev.getPointerId(pointerIndex));
         if (mPreviousVelocity != null) {
             checkMotionPaused(newVelocity, mPreviousVelocity, ev.getEventTime());
@@ -162,6 +172,9 @@
                 }
             }
         }
+        if (TestProtocol.sDebugTracing) {
+            Log.d(TestProtocol.MOTION_PAUSE_TIMEOUT, "checkMotionPaused: " + isPaused);
+        }
         updatePaused(isPaused);
     }
 
diff --git a/quickstep/src/com/android/quickstep/views/RecentsView.java b/quickstep/src/com/android/quickstep/views/RecentsView.java
index b077ca6..935305a 100644
--- a/quickstep/src/com/android/quickstep/views/RecentsView.java
+++ b/quickstep/src/com/android/quickstep/views/RecentsView.java
@@ -42,6 +42,7 @@
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_TASK_DISMISS_SWIPE_UP;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_TASK_LAUNCH_SWIPE_DOWN;
 import static com.android.launcher3.statehandlers.DepthController.DEPTH;
+import static com.android.launcher3.testing.TestProtocol.TASK_VIEW_ID_CRASH;
 import static com.android.launcher3.touch.PagedOrientationHandler.CANVAS_TRANSLATE;
 import static com.android.launcher3.util.Executors.MAIN_EXECUTOR;
 import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
@@ -82,6 +83,7 @@
 import android.text.TextPaint;
 import android.util.AttributeSet;
 import android.util.FloatProperty;
+import android.util.Log;
 import android.util.SparseBooleanArray;
 import android.view.HapticFeedbackConstants;
 import android.view.KeyEvent;
@@ -1222,6 +1224,9 @@
         // TODO set these type to array and check all taskIDs? Maybe we can get away w/ only one
         int runningTaskId = getTaskIdsForTaskViewId(mRunningTaskViewId)[0];
         int focusedTaskId = getTaskIdsForTaskViewId(mFocusedTaskViewId)[0];
+        Log.d(TASK_VIEW_ID_CRASH, "runningTaskId beforeBind: " + runningTaskId
+                + " runningTaskViewId: " + mRunningTaskViewId
+                + " forTaskView: " + getTaskViewFromTaskViewId(mRunningTaskViewId));
 
         // Rebind and reset all task views
         for (int i = requiredTaskCount - 1; i >= 0; i--) {
@@ -1246,6 +1251,18 @@
             // Update mRunningTaskViewId to be the new TaskView that was assigned by binding
             // the full list of tasks to taskViews
             newRunningTaskView = getTaskViewByTaskId(runningTaskId);
+            if (newRunningTaskView == null) {
+                StringBuilder sb = new StringBuilder();
+                for (int i = requiredTaskCount - 1; i >= 0; i--) {
+                    final int pageIndex = requiredTaskCount - i - 1 + mTaskViewStartIndex;
+                    final TaskView taskView = (TaskView) getChildAt(pageIndex);
+                    int taskViewId = taskView.getTaskViewId();
+                    sb.append(" taskViewId: " + taskViewId
+                            + " taskId: " + getTaskIdsForTaskViewId(taskViewId)[0]
+                            + " for taskView: " + taskView + "\n");
+                }
+                Log.d(TASK_VIEW_ID_CRASH, sb.toString());
+            }
             mRunningTaskViewId = newRunningTaskView.getTaskViewId();
         }
 
diff --git a/quickstep/src/com/android/quickstep/views/TaskThumbnailView.java b/quickstep/src/com/android/quickstep/views/TaskThumbnailView.java
index 320ea09..35e21ad 100644
--- a/quickstep/src/com/android/quickstep/views/TaskThumbnailView.java
+++ b/quickstep/src/com/android/quickstep/views/TaskThumbnailView.java
@@ -162,7 +162,9 @@
             mBitmapShader = new BitmapShader(bm, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);
             mPaint.setShader(mBitmapShader);
             updateThumbnailMatrix();
-            refreshOverlay();
+            if (mOverlayEnabled) {
+                getTaskOverlay().refreshActionVisibility(mThumbnailData);
+            }
         } else {
             mBitmapShader = null;
             mThumbnailData = null;
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 8249887..696c308 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -1930,7 +1930,7 @@
 
     @Override
     public boolean dispatchKeyEvent(KeyEvent event) {
-        TestLogging.recordEvent(TestProtocol.SEQUENCE_MAIN, "Key event", event);
+        TestLogging.recordKeyEvent(TestProtocol.SEQUENCE_MAIN, "Key event", event);
         return (event.getKeyCode() == KeyEvent.KEYCODE_HOME) || super.dispatchKeyEvent(event);
     }
 
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 83ca08d..ae42d74 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -16,8 +16,6 @@
 
 package com.android.launcher3;
 
-import static androidx.annotation.VisibleForTesting.PROTECTED;
-
 import static com.android.launcher3.LauncherAnimUtils.SPRING_LOADED_EXIT_DELAY;
 import static com.android.launcher3.LauncherSettings.Favorites.ITEM_TYPE_APPLICATION;
 import static com.android.launcher3.LauncherState.ALL_APPS;
@@ -65,8 +63,6 @@
 import android.view.accessibility.AccessibilityNodeInfo;
 import android.widget.Toast;
 
-import androidx.annotation.VisibleForTesting;
-
 import com.android.launcher3.accessibility.AccessibleDragListenerAdapter;
 import com.android.launcher3.accessibility.WorkspaceAccessibilityHelper;
 import com.android.launcher3.anim.Interpolators;
@@ -462,7 +458,6 @@
     }
 
     @Override
-    @VisibleForTesting(otherwise = PROTECTED)
     public int getPanelCount() {
         return isTwoPanelEnabled() ? 2 : super.getPanelCount();
     }
diff --git a/src/com/android/launcher3/testing/TestInformationHandler.java b/src/com/android/launcher3/testing/TestInformationHandler.java
index bc5129d..86acff7 100644
--- a/src/com/android/launcher3/testing/TestInformationHandler.java
+++ b/src/com/android/launcher3/testing/TestInformationHandler.java
@@ -102,14 +102,22 @@
                         l -> WidgetsFullSheet.getWidgetsView(l).getCurrentScrollY());
             }
 
+            case TestProtocol.REQUEST_TARGET_INSETS: {
+                return getUIProperty(Bundle::putParcelable, activity -> {
+                    WindowInsets insets = activity.getWindow()
+                            .getDecorView().getRootWindowInsets();
+                    return Insets.max(
+                            insets.getSystemGestureInsets(),
+                            insets.getSystemWindowInsets());
+                }, this::getCurrentActivity);
+            }
+
             case TestProtocol.REQUEST_WINDOW_INSETS: {
-                return getUIProperty(Bundle::putParcelable, a -> {
-                    WindowInsets insets = a.getWindow()
+                return getUIProperty(Bundle::putParcelable, activity -> {
+                    WindowInsets insets = activity.getWindow()
                             .getDecorView().getRootWindowInsets();
                     return Insets.subtract(
-                            Insets.max(
-                                    insets.getSystemGestureInsets(),
-                                    insets.getSystemWindowInsets()),
+                            insets.getSystemWindowInsets(),
                             Insets.of(0, 0, 0, mDeviceProfile.nonOverlappingTaskbarInset));
                 }, this::getCurrentActivity);
             }
@@ -130,13 +138,18 @@
 
             case TestProtocol.REQUEST_IS_TWO_PANELS:
                 response.putBoolean(TestProtocol.TEST_INFO_RESPONSE_FIELD,
-                    mDeviceProfile.isTwoPanels);
+                        mDeviceProfile.isTwoPanels);
                 return response;
 
             case TestProtocol.REQUEST_SET_FORCE_PAUSE_TIMEOUT:
                 TestProtocol.sForcePauseTimeout = Long.parseLong(arg);
                 return response;
 
+            case TestProtocol.REQUEST_GET_HAD_NONTEST_EVENTS:
+                response.putBoolean(
+                        TestProtocol.TEST_INFO_RESPONSE_FIELD, TestLogging.sHadEventsNotFromTest);
+                return response;
+
             default:
                 return null;
         }
diff --git a/src/com/android/launcher3/testing/TestLogging.java b/src/com/android/launcher3/testing/TestLogging.java
index 51e0819..6cdd3ca 100644
--- a/src/com/android/launcher3/testing/TestLogging.java
+++ b/src/com/android/launcher3/testing/TestLogging.java
@@ -17,6 +17,7 @@
 package com.android.launcher3.testing;
 
 import android.util.Log;
+import android.view.KeyEvent;
 import android.view.MotionEvent;
 
 import com.android.launcher3.Utilities;
@@ -25,6 +26,7 @@
 
 public final class TestLogging {
     private static BiConsumer<String, String> sEventConsumer;
+    public static boolean sHadEventsNotFromTest;
 
     private static void recordEventSlow(String sequence, String event) {
         Log.d(TestProtocol.TAPL_EVENTS_TAG, sequence + " / " + event);
@@ -46,9 +48,17 @@
         }
     }
 
+    public static void recordKeyEvent(String sequence, String message, KeyEvent event) {
+        if (Utilities.IS_RUNNING_IN_TEST_HARNESS) {
+            recordEventSlow(sequence, message + ": " + event);
+            if (event.getDeviceId() != -1) sHadEventsNotFromTest = true;
+        }
+    }
+
     public static void recordMotionEvent(String sequence, String message, MotionEvent event) {
         if (Utilities.IS_RUNNING_IN_TEST_HARNESS && event.getAction() != MotionEvent.ACTION_MOVE) {
             recordEventSlow(sequence, message + ": " + event);
+            if (event.getDeviceId() != -1) sHadEventsNotFromTest = true;
         }
     }
 
diff --git a/src/com/android/launcher3/testing/TestProtocol.java b/src/com/android/launcher3/testing/TestProtocol.java
index d73c4b4..38cbbe7 100644
--- a/src/com/android/launcher3/testing/TestProtocol.java
+++ b/src/com/android/launcher3/testing/TestProtocol.java
@@ -86,6 +86,7 @@
     public static final String REQUEST_APP_LIST_FREEZE_FLAGS = "app-list-freeze-flags";
     public static final String REQUEST_APPS_LIST_SCROLL_Y = "apps-list-scroll-y";
     public static final String REQUEST_WIDGETS_SCROLL_Y = "widgets-scroll-y";
+    public static final String REQUEST_TARGET_INSETS = "target-insets";
     public static final String REQUEST_WINDOW_INSETS = "window-insets";
     public static final String REQUEST_PID = "pid";
     public static final String REQUEST_FORCE_GC = "gc";
@@ -93,6 +94,7 @@
     public static final String REQUEST_RECENT_TASKS_LIST = "recent-tasks-list";
     public static final String REQUEST_START_EVENT_LOGGING = "start-event-logging";
     public static final String REQUEST_GET_TEST_EVENTS = "get-test-events";
+    public static final String REQUEST_GET_HAD_NONTEST_EVENTS = "get-had-nontest-events";
     public static final String REQUEST_STOP_EVENT_LOGGING = "stop-event-logging";
     public static final String REQUEST_CLEAR_DATA = "clear-data";
     public static final String REQUEST_IS_TABLET = "is-tablet";
@@ -116,4 +118,6 @@
     public static final String WORK_PROFILE_REMOVED = "b/159671700";
     public static final String FALLBACK_ACTIVITY_NO_SET = "b/181019015";
     public static final String THIRD_PARTY_LAUNCHER_NOT_SET = "b/187080582";
+    public static final String MOTION_PAUSE_TIMEOUT = "b/194114179";
+    public static final String TASK_VIEW_ID_CRASH = "b/195430732";
 }
diff --git a/src/com/android/launcher3/util/WallpaperOffsetInterpolator.java b/src/com/android/launcher3/util/WallpaperOffsetInterpolator.java
index b8554e4..c51f66f 100644
--- a/src/com/android/launcher3/util/WallpaperOffsetInterpolator.java
+++ b/src/com/android/launcher3/util/WallpaperOffsetInterpolator.java
@@ -63,31 +63,37 @@
      *
      * TODO: do different behavior if it's  a live wallpaper?
      */
-    private void wallpaperOffsetForScroll(int scroll, int numScrollingPages, final int[] out) {
+    private void wallpaperOffsetForScroll(int scroll, int numScrollableScreens, final int[] out) {
         out[1] = 1;
 
         // To match the default wallpaper behavior in the system, we default to either the left
         // or right edge on initialization
-        if (mLockedToDefaultPage || numScrollingPages <= 1) {
+        if (mLockedToDefaultPage || numScrollableScreens <= 1) {
             out[0] =  mIsRtl ? 1 : 0;
             return;
         }
 
         // Distribute the wallpaper parallax over a minimum of MIN_PARALLAX_PAGE_SPAN workspace
         // screens, not including the custom screen, and empty screens (if > MIN_PARALLAX_PAGE_SPAN)
-        int numPagesForWallpaperParallax = mWallpaperIsLiveWallpaper ? numScrollingPages :
-                        Math.max(MIN_PARALLAX_PAGE_SPAN, numScrollingPages);
+        int numScreensForWallpaperParallax = mWallpaperIsLiveWallpaper ? numScrollableScreens :
+                        Math.max(MIN_PARALLAX_PAGE_SPAN, numScrollableScreens);
 
         // Offset by the custom screen
-        int leftPageIndex;
-        int rightPageIndex;
-        if (mIsRtl) {
-            rightPageIndex = 0;
-            leftPageIndex = rightPageIndex + numScrollingPages - 1;
-        } else {
-            leftPageIndex = 0;
-            rightPageIndex = leftPageIndex + numScrollingPages - 1;
-        }
+
+        // Don't confuse screens & pages in this function. In a phone UI, we often use screens &
+        // pages interchangeably. However, in a n-panels UI, where n > 1, the screen in this class
+        // means the scrollable screen. Each screen can consist of at most n panels.
+        // Each panel has at most 1 page. Take 5 pages in 2 panels UI as an example, the Workspace
+        // looks as follow:
+        //
+        // S: scrollable screen, P: page, <E>: empty
+        //   S0        S1         S2
+        // _______   _______   ________
+        // |P0|P1|   |P2|P3|   |P4|<E>|
+        // ¯¯¯¯¯¯¯   ¯¯¯¯¯¯¯   ¯¯¯¯¯¯¯¯
+        int endIndex = getNumPagesExcludingEmpty() - 1;
+        final int leftPageIndex = mIsRtl ? endIndex : 0;
+        final int rightPageIndex = mIsRtl ? 0 : endIndex;
 
         // Calculate the scroll range
         int leftPageScrollX = mWorkspace.getScrollForPage(leftPageIndex);
@@ -103,34 +109,56 @@
         int adjustedScroll = scroll - leftPageScrollX -
                 mWorkspace.getLayoutTransitionOffsetForPage(0);
         adjustedScroll = Utilities.boundToRange(adjustedScroll, 0, scrollRange);
-        out[1] = (numPagesForWallpaperParallax - 1) * scrollRange;
+        out[1] = (numScreensForWallpaperParallax - 1) * scrollRange;
 
         // The offset is now distributed 0..1 between the left and right pages that we care about,
         // so we just map that between the pages that we are using for parallax
         int rtlOffset = 0;
         if (mIsRtl) {
             // In RTL, the pages are right aligned, so adjust the offset from the end
-            rtlOffset = out[1] - (numScrollingPages - 1) * scrollRange;
+            rtlOffset = out[1] - (numScrollableScreens - 1) * scrollRange;
         }
-        out[0] = rtlOffset + adjustedScroll * (numScrollingPages - 1);
+        out[0] = rtlOffset + adjustedScroll * (numScrollableScreens - 1);
     }
 
     public float wallpaperOffsetForScroll(int scroll) {
-        wallpaperOffsetForScroll(scroll, getNumScreensExcludingEmpty(), sTempInt);
+        wallpaperOffsetForScroll(scroll, getNumScrollableScreensExcludingEmpty(), sTempInt);
         return ((float) sTempInt[0]) / sTempInt[1];
     }
 
-    private int getNumScreensExcludingEmpty() {
-        int numScrollingPages = mWorkspace.getChildCount();
-        if (numScrollingPages >= MIN_PARALLAX_PAGE_SPAN && mWorkspace.hasExtraEmptyScreen()) {
-            return numScrollingPages - 1;
+    /**
+     * Returns the number of screens that can be scrolled.
+     *
+     * <p>In an usual phone UI, the number of scrollable screens is equal to the number of
+     * CellLayouts because each screen has exactly 1 CellLayout.
+     *
+     * <p>In a n-panels UI, a screen shows n panels. Each panel has at most 1 CellLayout. Take
+     * 2-panels UI as an example: let's say there are 5 CellLayouts in the Workspace. the number of
+     * scrollable screens will be 3 = ⌈5 / 2⌉.
+     */
+    private int getNumScrollableScreensExcludingEmpty() {
+        float numOfPages = getNumPagesExcludingEmpty();
+        return (int) Math.ceil(numOfPages / mWorkspace.getPanelCount());
+    }
+
+    /**
+     * Returns the number of non-empty pages in the Workspace.
+     *
+     * <p>If a user starts dragging on the rightmost (or leftmost in RTL), an empty CellLayout is
+     * added to the Workspace. This empty CellLayout add as a hover-over target for adding a new
+     * page. To avoid janky motion effect, we ignore this empty CellLayout.
+     */
+    private int getNumPagesExcludingEmpty() {
+        int numOfPages = mWorkspace.getChildCount();
+        if (numOfPages >= MIN_PARALLAX_PAGE_SPAN && mWorkspace.hasExtraEmptyScreen()) {
+            return numOfPages - 1;
         } else {
-            return numScrollingPages;
+            return numOfPages;
         }
     }
 
     public void syncWithScroll() {
-        int numScreens = getNumScreensExcludingEmpty();
+        int numScreens = getNumScrollableScreensExcludingEmpty();
         wallpaperOffsetForScroll(mWorkspace.getScrollX(), numScreens, sTempInt);
         Message msg = Message.obtain(mHandler, MSG_UPDATE_OFFSET, sTempInt[0], sTempInt[1],
                 mWindowToken);
diff --git a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
index dcb6dc1..0d5b9ad 100644
--- a/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
+++ b/tests/src/com/android/launcher3/ui/AbstractLauncherUiTest.java
@@ -254,26 +254,12 @@
         return mDevice;
     }
 
-    private boolean hasSystemUiObject(String resId) {
-        return mDevice.hasObject(By.res(SYSTEMUI_PACKAGE, resId));
-    }
-
     @Before
     public void setUp() throws Exception {
         mLauncher.onTestStart();
-        Log.d(TAG, "Before disabling battery defender");
-        mDevice.executeShellCommand("setprop vendor.battery.defender.disable 1");
-        Log.d(TAG, "Before enabling stay awake");
-        mDevice.executeShellCommand("settings put global stay_on_while_plugged_in 3");
-        for (int i = 0; i < 10 && hasSystemUiObject("keyguard_status_view"); ++i) {
-            Log.d(TAG, "Before unlocking the phone");
-            mDevice.executeShellCommand("input keyevent 82");
-            mDevice.waitForIdle();
-        }
-        Assert.assertTrue("Keyguard still visible",
+        Assert.assertTrue("Keyguard is visible, which is likely caused by a crash in SysUI",
                 TestHelpers.wait(
                         Until.gone(By.res(SYSTEMUI_PACKAGE, "keyguard_status_view")), 60000));
-        Log.d(TAG, "Keyguard is not visible");
 
         final String launcherPackageName = mDevice.getLauncherPackageName();
         try {
diff --git a/tests/src/com/android/launcher3/util/rule/FailureWatcher.java b/tests/src/com/android/launcher3/util/rule/FailureWatcher.java
index 5fbf847..60529a4 100644
--- a/tests/src/com/android/launcher3/util/rule/FailureWatcher.java
+++ b/tests/src/com/android/launcher3/util/rule/FailureWatcher.java
@@ -13,6 +13,7 @@
 
 import org.junit.rules.TestWatcher;
 import org.junit.runner.Description;
+import org.junit.runners.model.Statement;
 
 import java.io.File;
 import java.io.FileOutputStream;
@@ -38,6 +39,26 @@
     }
 
     @Override
+    public Statement apply(Statement base, Description description) {
+        return new Statement() {
+            @Override
+            public void evaluate() throws Throwable {
+                try {
+                    base.evaluate();
+                } finally {
+                    if (mLauncher.hadNontestEvents()) {
+                        throw new AssertionError(
+                                "Launcher received events not sent by the test. This may mean "
+                                        + "that the touch screen of the lab device has sent false"
+                                        + " events. See the logcat for TaplEvents tag and look "
+                                        + "for events with deviceId != -1");
+                    }
+                }
+            }
+        };
+    }
+
+    @Override
     protected void failed(Throwable e, Description description) {
         onError(mDevice, description, e);
     }
diff --git a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
index abcc778..ded4282 100644
--- a/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
+++ b/tests/tapl/com/android/launcher3/tapl/LauncherInstrumentation.java
@@ -288,6 +288,11 @@
     }
 
     Insets getTargetInsets() {
+        return getTestInfo(TestProtocol.REQUEST_TARGET_INSETS)
+                .getParcelable(TestProtocol.TEST_INFO_RESPONSE_FIELD);
+    }
+
+    Insets getWindowInsets() {
         return getTestInfo(TestProtocol.REQUEST_WINDOW_INSETS)
                 .getParcelable(TestProtocol.TEST_INFO_RESPONSE_FIELD);
     }
@@ -306,6 +311,11 @@
         getTestInfo(TestProtocol.REQUEST_SET_FORCE_PAUSE_TIMEOUT, Long.toString(timeout));
     }
 
+    public boolean hadNontestEvents() {
+        return getTestInfo(TestProtocol.REQUEST_GET_HAD_NONTEST_EVENTS)
+                .getBoolean(TestProtocol.TEST_INFO_RESPONSE_FIELD);
+    }
+
     void setActiveContainer(VisibleContainer container) {
         sActiveContainer = new WeakReference<>(container);
     }
@@ -1128,7 +1138,7 @@
     }
 
     int getBottomGestureSize() {
-        return Math.max(getTargetInsets().bottom, ResourceUtils.getNavbarSize(
+        return Math.max(getWindowInsets().bottom, ResourceUtils.getNavbarSize(
                 ResourceUtils.NAVBAR_BOTTOM_GESTURE_SIZE, getResources())) + 1;
     }