Fixes for floating search bar (e.g. background protection).

- Adds background protection for the search bar
 - Views animating based on keyboard now support manual swipes.

Bug: 213954333
Bug: 259004115
Bug: 251460671
Test: Manual
Change-Id: I055766126fb46a8e8b48907e442c9e54aaa4badf

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

@@ -282,7 +282,7 @@ public class ActivityAllAppsContainerView<T extends Context & AppLauncher
     @Override
     public int getHeaderBottom() {
         if (FeatureFlags.ENABLE_FLOATING_SEARCH_BAR.get()) {
-            return super.getHeaderBottom();
+            return super.getHeaderBottom() + mHeader.getClipTop();
         }
         return super.getHeaderBottom() + mSearchContainer.getBottom();
     }