Merge changes Ib0fae780,I6d14f106 into ub-launcher3-master

* changes:
  Standardize quickstep velocities
  Don't detach recents from app window after motion pause

src/com/android/launcher3/util/VelocityUtils.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2020 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.util;
+
+/**
+ * Contains some constants and functions to standardize velocity usage.
+ */
+public class VelocityUtils {
+
+    /**
+     * Unit to pass to {@link android.view.VelocityTracker#computeCurrentVelocity(int)}.
+     */
+    public static final int PX_PER_MS = 1;
+
+}