Avoid AllApps bottom sheet from being and add collapse handle

- Instead of using top margin, use top padding instead
- Add a separate LinearView for the bottom sheet background
- Added a handle to bottom sheet background that handle touches

Bug: 208599118
Test: phone, tablet and taskbar
Change-Id: Id8d3cb5ee6c58193926e2cf5ea7b0cb2280098be

src/com/android/launcher3/allapps/SecondaryLauncherAllAppsContainerView.java

@@ -0,0 +1,45 @@
+/*
+ * 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.launcher3.allapps;
+
+import android.content.Context;
+import android.util.AttributeSet;
+
+import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.secondarydisplay.SecondaryDisplayLauncher;
+
+/**
+ * AllAppsContainerView for secondary launcher
+ */
+public class SecondaryLauncherAllAppsContainerView extends
+        ActivityAllAppsContainerView<SecondaryDisplayLauncher> {
+
+    public SecondaryLauncherAllAppsContainerView(Context context) {
+        this(context, null);
+    }
+
+    public SecondaryLauncherAllAppsContainerView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public SecondaryLauncherAllAppsContainerView(Context context, AttributeSet attrs,
+            int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+    }
+
+    @Override
+    protected void updateBackground(DeviceProfile deviceProfile) {}
+}