[packages/apps/Launcher3] MultiWindow:no use shade background

packages/apps/Launcher3/res/layout/launcher_win.xml

@@ -22,7 +22,6 @@
     android:id="@+id/launcher"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@drawable/workspace_bg"
     android:fitsSystemWindows="true">
 
     <com.android.launcher3.DragLayer

packages/apps/Launcher3/src/com/android/launcher3/Launcher.java

@@ -3302,7 +3302,8 @@ public class Launcher extends Activity
     }
 
     private void setWorkspaceBackground(boolean workspace) {
-        mLauncherView.setBackground(workspace ?
+        boolean isMultiMode = (0 != Settings.System.getInt(getContentResolver(), "multi_window_config", 0));
+        mLauncherView.setBackground(workspace&&!isMultiMode ?
                 mWorkspaceBackgroundDrawable : null);
     }