diff --git a/res/values-sw340dp/dimens.xml b/res/values-sw340dp/dimens.xml
index c9f2981..33b06f5 100644
--- a/res/values-sw340dp/dimens.xml
+++ b/res/values-sw340dp/dimens.xml
@@ -19,6 +19,5 @@
 
     <!-- Drag padding to add to the bottom of drop targets -->
     <dimen name="drop_target_drag_padding">20dp</dimen>
-    <dimen name="drop_target_text_size">16sp</dimen>
 
 </resources>
\ No newline at end of file
diff --git a/res/values/dimens.xml b/res/values/dimens.xml
index 9891ff5..4473f05 100644
--- a/res/values/dimens.xml
+++ b/res/values/dimens.xml
@@ -189,8 +189,9 @@
 <!-- Dragging -->
     <!-- Drag padding to add to the bottom of drop targets -->
     <dimen name="drop_target_drag_padding">14dp</dimen>
-    <dimen name="drop_target_text_size">20sp</dimen>
+    <dimen name="drop_target_text_size">16sp</dimen>
     <dimen name="drop_target_shadow_elevation">2dp</dimen>
+    <dimen name="drop_target_bar_margin_horizontal">4dp</dimen>
 
     <!-- the distance an icon must be dragged before button drop targets accept it -->
     <dimen name="drag_distanceThreshold">30dp</dimen>
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 09c8b9b..a926cb5 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -258,7 +258,7 @@
     <!-- Drop targets -->
     <style name="DropTargetButtonBase" parent="@android:style/TextAppearance.DeviceDefault">
         <item name="android:drawablePadding">8dp</item>
-        <item name="android:padding">16dp</item>
+        <item name="android:padding">14dp</item>
         <item name="android:textColor">@color/drop_target_text</item>
         <item name="android:textSize">@dimen/drop_target_text_size</item>
         <item name="android:singleLine">true</item>
diff --git a/src/com/android/launcher3/DropTargetBar.java b/src/com/android/launcher3/DropTargetBar.java
index 4a1b084..88f6c49 100644
--- a/src/com/android/launcher3/DropTargetBar.java
+++ b/src/com/android/launcher3/DropTargetBar.java
@@ -105,7 +105,8 @@
                         / (2 * (grid.inv.numColumns + 1)))
                         + grid.edgeMarginPx;
             } else {
-                gap = grid.desiredWorkspaceLeftRightMarginPx - grid.inv.defaultWidgetPadding.right;
+                gap = getContext().getResources()
+                        .getDimensionPixelSize(R.dimen.drop_target_bar_margin_horizontal);
             }
             lp.width = grid.availableWidthPx - 2 * gap;
 
diff --git a/tests/src/com/android/launcher3/util/rule/ShellCommandRule.java b/tests/src/com/android/launcher3/util/rule/ShellCommandRule.java
index 0ec0f02..2b2fef4 100644
--- a/tests/src/com/android/launcher3/util/rule/ShellCommandRule.java
+++ b/tests/src/com/android/launcher3/util/rule/ShellCommandRule.java
@@ -15,21 +15,27 @@
  */
 package com.android.launcher3.util.rule;
 
-import static com.android.launcher3.tapl.TestHelpers.getLauncherInMyProcess;
-
 import static androidx.test.InstrumentationRegistry.getInstrumentation;
 
+import static com.android.launcher3.tapl.TestHelpers.getLauncherInMyProcess;
+
 import android.content.ComponentName;
 import android.content.pm.ActivityInfo;
-
-import org.junit.rules.TestRule;
-import org.junit.runner.Description;
-import org.junit.runners.model.Statement;
+import android.util.Log;
 
 import androidx.annotation.Nullable;
 import androidx.test.InstrumentationRegistry;
 import androidx.test.uiautomator.UiDevice;
 
+import com.android.systemui.shared.system.PackageManagerWrapper;
+
+import org.junit.Assert;
+import org.junit.rules.TestRule;
+import org.junit.runner.Description;
+import org.junit.runners.model.Statement;
+
+import java.util.ArrayList;
+
 /**
  * Test rule which executes a shell command at the start of the test.
  */
@@ -37,10 +43,19 @@
 
     private final String mCmd;
     private final String mRevertCommand;
+    private final boolean mCheckSuccess;
+    private final Runnable mAdditionalChecks;
 
-    public ShellCommandRule(String cmd, @Nullable String revertCommand) {
+    public ShellCommandRule(String cmd, @Nullable String revertCommand, boolean checkSuccess,
+            Runnable additionalChecks) {
         mCmd = cmd;
         mRevertCommand = revertCommand;
+        mCheckSuccess = checkSuccess;
+        mAdditionalChecks = additionalChecks;
+    }
+
+    public ShellCommandRule(String cmd, @Nullable String revertCommand) {
+        this(cmd, revertCommand, false, null);
     }
 
     @Override
@@ -48,12 +63,27 @@
         return new Statement() {
             @Override
             public void evaluate() throws Throwable {
-                UiDevice.getInstance(getInstrumentation()).executeShellCommand(mCmd);
+                final String result =
+                        UiDevice.getInstance(getInstrumentation()).executeShellCommand(mCmd);
+                if (mCheckSuccess) {
+                    Assert.assertTrue(
+                            "Failed command: " + mCmd + ", result: " + result,
+                            "Success".equals(result.replaceAll("\\s", "")));
+                }
+                if (mAdditionalChecks != null) mAdditionalChecks.run();
                 try {
                     base.evaluate();
                 } finally {
                     if (mRevertCommand != null) {
-                        UiDevice.getInstance(getInstrumentation()).executeShellCommand(mRevertCommand);
+                        final String revertResult = UiDevice.getInstance(
+                                getInstrumentation()).executeShellCommand(
+                                mRevertCommand);
+                        if (mCheckSuccess) {
+                            Assert.assertTrue(
+                                    "Failed command: " + mRevertCommand
+                                            + ", result: " + revertResult,
+                                    "Success".equals(result.replaceAll("\\s", "")));
+                        }
                     }
                 }
             }
@@ -72,7 +102,15 @@
      * Sets the target launcher as default launcher.
      */
     public static ShellCommandRule setDefaultLauncher() {
-        return new ShellCommandRule(getLauncherCommand(getLauncherInMyProcess()), null);
+        final ActivityInfo launcher = getLauncherInMyProcess();
+        Log.d("b/187080582", "Launcher: " + new ComponentName(launcher.packageName, launcher.name)
+                .flattenToString());
+        return new ShellCommandRule(getLauncherCommand(launcher), null, true, () ->
+                Assert.assertEquals("Setting default launcher failed",
+                        new ComponentName(launcher.packageName, launcher.name)
+                                .flattenToString(),
+                        PackageManagerWrapper.getInstance().getHomeActivities(new ArrayList<>())
+                                .flattenToString()));
     }
 
     public static String getLauncherCommand(ActivityInfo launcher) {
diff --git a/tests/tapl/com/android/launcher3/tapl/LogEventChecker.java b/tests/tapl/com/android/launcher3/tapl/LogEventChecker.java
index a809e2e..710e3cd 100644
--- a/tests/tapl/com/android/launcher3/tapl/LogEventChecker.java
+++ b/tests/tapl/com/android/launcher3/tapl/LogEventChecker.java
@@ -15,6 +15,10 @@
  */
 package com.android.launcher3.tapl;
 
+import static com.android.launcher3.testing.TestProtocol.SEQUENCE_MAIN;
+import static com.android.launcher3.testing.TestProtocol.SEQUENCE_PILFER;
+import static com.android.launcher3.testing.TestProtocol.SEQUENCE_TIS;
+
 import android.os.SystemClock;
 
 import com.android.launcher3.testing.TestProtocol;
@@ -87,6 +91,24 @@
         final ListMap<String> actualEvents = finishSync(waitForExpectedCountMs);
         if (actualEvents == null) return "null event sequences because launcher likely died";
 
+        final String lowLevelDiags = lowLevelMismatchDiagnostics(actualEvents);
+        // If we have a sequence mismatch for a successful gesture, we want to provide all low-level
+        // details.
+        if (successfulGesture) {
+            return lowLevelDiags;
+        }
+
+        final String sequenceMismatchInEnglish = highLevelMismatchDiagnostics(actualEvents);
+
+        if (sequenceMismatchInEnglish != null) {
+            LauncherInstrumentation.log(lowLevelDiags);
+            return "Hint: " + sequenceMismatchInEnglish;
+        } else {
+            return lowLevelDiags;
+        }
+    }
+
+    private String lowLevelMismatchDiagnostics(ListMap<String> actualEvents) {
         final StringBuilder sb = new StringBuilder();
         boolean hasMismatches = false;
         for (Map.Entry<String, List<Pattern>> expectedEvents : mExpectedEvents.entrySet()) {
@@ -118,6 +140,42 @@
         return hasMismatches ? "Mismatching events: " + sb.toString() : null;
     }
 
+    private String highLevelMismatchDiagnostics(ListMap<String> actualEvents) {
+        if (!mExpectedEvents.getNonNull(SEQUENCE_TIS).isEmpty()
+                && actualEvents.getNonNull(SEQUENCE_TIS).isEmpty()) {
+            return "TouchInteractionService didn't receive any of the touch events sent by the "
+                    + "test";
+        }
+        if (getMismatchPosition(mExpectedEvents.getNonNull(SEQUENCE_TIS),
+                actualEvents.getNonNull(SEQUENCE_TIS)) != -1) {
+            // If TIS has a mismatch that we can't convert to high-level diags, don't convert
+            // other sequences either.
+            return null;
+        }
+
+        if (mExpectedEvents.getNonNull(SEQUENCE_PILFER).size() == 1
+                && actualEvents.getNonNull(SEQUENCE_PILFER).isEmpty()) {
+            return "Launcher didn't detect the navigation gesture sent by the test";
+        }
+        if (mExpectedEvents.getNonNull(SEQUENCE_PILFER).isEmpty()
+                && actualEvents.getNonNull(SEQUENCE_PILFER).size() == 1) {
+            return "Launcher detected a navigation gesture, but the test didn't send one";
+        }
+        if (getMismatchPosition(mExpectedEvents.getNonNull(SEQUENCE_PILFER),
+                actualEvents.getNonNull(SEQUENCE_PILFER)) != -1) {
+            // If Pilfer has a mismatch that we can't convert to high-level diags, don't analyze
+            // other sequences.
+            return null;
+        }
+
+        if (!mExpectedEvents.getNonNull(SEQUENCE_MAIN).isEmpty()
+                && actualEvents.getNonNull(SEQUENCE_MAIN).isEmpty()) {
+            return "None of the touch or keyboard events sent by the test was received by "
+                    + "Launcher's main thread";
+        }
+        return null;
+    }
+
     // If the list of actual events matches the list of expected events, returns -1, otherwise
     // the position of the mismatch.
     private static int getMismatchPosition(List<Pattern> expected, List<String> actual) {