Merge pull request #249 from sliverappbar/chore

chore: resolve deprecation warning issue

lib/pages/viewer/others/preload_page_view.dart

@@ -1014,7 +1014,7 @@ class PageScrollPhysics extends ScrollPhysics {
         (velocity >= 0.0 && position.pixels >= position.maxScrollExtent)) {
       return super.createBallisticSimulation(position, velocity);
     }
-    final Tolerance tolerance = this.tolerance;
+    final Tolerance tolerance = toleranceFor(position);
     final double target =
         _getTargetPixels(position as ScrollPosition, tolerance, velocity);
     if (target != position.pixels) {