NO PARTIAL RERUN: Do not return recycled bitmaps

There's also no need to offload WallpaperManager#forgetLoadedBitmap
because Bitmap#recycle is asynchronous - and the whole method is
synchronized.

Fixes 77597550
Test: atest cts/tests/framework/base/activitymanager/src/android/server/am/ActivityManagerMultiDisplayTests.java

Change-Id: I88014e21bd05e10c2f524393bb637596708e4e63

core/java/android/app/WallpaperManager.java

@@ -401,7 +401,8 @@ public class WallpaperManager {
                 }
             }
             synchronized (this) {
-                if (mCachedWallpaper != null && mCachedWallpaperUserId == userId) {
+                if (mCachedWallpaper != null && mCachedWallpaperUserId == userId
+                        && !mCachedWallpaper.isRecycled()) {
                     return mCachedWallpaper;
                 }
                 mCachedWallpaper = null;

packages/SystemUI/src/com/android/systemui/ImageWallpaper.java

@@ -444,13 +444,7 @@ public class ImageWallpaper extends WallpaperService {
             final Surface surface = getSurfaceHolder().getSurface();
             surface.hwuiDestroy();
 
-            mLoader = new AsyncTask<Void, Void, Bitmap>() {
-                @Override
-                protected Bitmap doInBackground(Void... params) {
-                    mWallpaperManager.forgetLoadedWallpaper();
-                    return null;
-                }
-            }.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
+            mWallpaperManager.forgetLoadedWallpaper();
         }
 
         private void scheduleUnloadWallpaper() {