Default search bar: Clip ripple to background shape (resolves #2148)

res/layout/qsb_default_view.xml

@@ -21,6 +21,7 @@
              android:layout_height="match_parent">
 
     <LinearLayout
+        android:id="@+id/qsb_background"
         android:layout_width="match_parent"
         android:layout_height="48dp"
         android:layout_gravity="center_vertical"

src/com/android/launcher3/qsb/QsbWidgetHostView.java

@@ -89,6 +89,7 @@ public class QsbWidgetHostView extends NavigableAppWidgetHostView {
                 .inflate(R.layout.qsb_default_view, parent, false);
         v.findViewById(R.id.btn_qsb_search).setOnClickListener((v2) ->
                 Launcher.getLauncher(v2.getContext()).startSearch("", false, null, true));
+        v.findViewById(R.id.qsb_background).setClipToOutline(true);
         return v;
     }