Make `pageGlobalKeys` predefined

@@ -110,7 +110,7 @@ class PdfPreviewCustomState extends State<PdfPreviewCustom>
     with PdfPreviewRaster {
     with PdfPreviewRaster {
   final listView = GlobalKey();
   final listView = GlobalKey();
 
 
-  List<GlobalKey> _pageGlobalKeys = <GlobalKey>[];
+  final _pageGlobalKeys = List.generate(100, (index) => GlobalKey());
 
 
   bool infoLoaded = false;
   bool infoLoaded = false;
 
 
@@ -217,11 +217,6 @@ class PdfPreviewCustomState extends State<PdfPreviewCustom>
           );
           );
     }
     }
 
 
-    _pageGlobalKeys = List.generate(
-      pages.length,
-      (index) => GlobalKey(debugLabel: 'pdf-page-$index'),
-    );
-
     if (widget.pagesBuilder != null) {
     if (widget.pagesBuilder != null) {
       return widget.pagesBuilder!(context, pages);
       return widget.pagesBuilder!(context, pages);
     }
     }