Replace taskbar hotseat with real hotseat when folder is open

- Seamlessly show real hotseat and hide taskbar hotseat, while
  keeping rest of taskbar visible
- Update MultiValueAlpha to allow for taking max alpha instead
  of blending, and use that for Hotseat
- Fix folder open bounds on home screen when taskbar is present

Test: Open folder from taskbar on home, can drag out items
Bug: 182079330
Bug: 171917176
Change-Id: I7c1983e3219b1341cf233260f0ccac9051c4dc14
diff --git a/quickstep/res/layout/taskbar.xml b/quickstep/res/layout/taskbar.xml
index b124b33..84e2304 100644
--- a/quickstep/res/layout/taskbar.xml
+++ b/quickstep/res/layout/taskbar.xml
@@ -25,7 +25,6 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="@color/taskbar_background"
-        android:gravity="center"
-        android:animateLayoutChanges="true"/>
+        android:gravity="center"/>
 
 </com.android.launcher3.taskbar.TaskbarContainerView>
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