Merge "Fix the wallpaper not hiding immediately" into main

        // Commit wallpaper visibility after activity, because usually the wallpaper target token is

        // an activity, and wallpaper's visibility depends on activity's visibility.

        for (int i = mParticipants.size() - 1; i >= 0; --i) {

            final WallpaperWindowToken wt = mParticipants.valueAt(i).asWallpaperToken();

            final WindowContainer<?> wc = mParticipants.valueAt(i);

            WallpaperWindowToken wt = wc.asWallpaperToken();

            if (!Flags.ensureWallpaperInTransitions()) {

                if (wt == null) {

                    final WindowState windowState = wc.asWindowState();

                    if (windowState != null) {

                        wt = windowState.mToken.asWallpaperToken();

                    }

                }

            }

            if (wt == null) continue;

            final WindowState target = wt.mDisplayContent.mWallpaperController.getWallpaperTarget();

            final boolean isTargetInvisible = target == null || !target.mToken.isVisible();