Fix favourite scene data restore

app/src/main/java/com/hippo/ehviewer/ui/scene/FavoritesScene.java

@@ -22,6 +22,7 @@ import android.content.Context;
 import android.content.DialogInterface;
 import android.content.res.Resources;
 import android.os.Bundle;
+import android.os.Parcelable;
 import android.text.InputType;
 import android.text.TextUtils;
 import android.util.SparseBooleanArray;
@@ -1307,5 +1308,19 @@ public class FavoritesScene extends BaseScene implements
             super.onClearData();
             nextPg = null;
         }
+
+        @Override
+        protected Parcelable saveInstanceState(Parcelable superState) {
+            Bundle bundle = (Bundle) super.saveInstanceState(superState);
+            bundle.putString(KEY_NEXT_PAGE, nextPg);
+            return bundle;
+        }
+
+        @Override
+        protected Parcelable restoreInstanceState(Parcelable state) {
+            Bundle bundle = (Bundle) state;
+            nextPg = bundle.getString(KEY_NEXT_PAGE);
+            return super.restoreInstanceState(state);
+        }
     }
 }

app/src/main/java/com/hippo/ehviewer/widget/GalleryInfoContentHelper.java

@@ -37,6 +37,8 @@ public abstract class GalleryInfoContentHelper extends ContentLayout.ContentHelp
     private static final String KEY_DATA_MAP = "data_map";
     private static final String KEY_MAX_GID = "max_gid";
     private static final String KEY_MIN_GID = "min_gid";
+
+    public static final String KEY_NEXT_PAGE = "next_page";
     private final FavouriteStatusRouter.Listener listener;
     @SuppressLint("UseSparseArrays")
     private Map<Long, GalleryInfo> map = new HashMap<>();