Fix scroll not working for presentations

Author: vladimir-litvinchik

libs/viewer/src/lib/viewer-app.component.ts

@@ -735,6 +735,7 @@ export class ViewerAppComponent implements OnInit, OnDestroy, AfterViewInit {
       if (this.startScrollTime - this.endScrollTime > 300 && this.vertScrollEnded(true)) {
         this.selectedPageNumber = this.selectedPageNumber - 1;
         this.endScrollTime = Date.now();
+        this._navigateService.currentPage = this.selectedPageNumber;
       }
     }
   }
@@ -747,9 +748,11 @@ export class ViewerAppComponent implements OnInit, OnDestroy, AfterViewInit {
         if (this.file.pages[this.selectedPageNumber] && !this.file.pages[this.selectedPageNumber].data) {
           this.preloadPages(this.selectedPageNumber, this.selectedPageNumber + 1);
           this.selectedPageNumber = this.selectedPageNumber + 1;
+          this._navigateService.currentPage = this.selectedPageNumber;
         }
         else {
           this.selectedPageNumber = this.selectedPageNumber + 1;
+          this._navigateService.currentPage = this.selectedPageNumber;
         }
         this.endScrollTime = Date.now();
       }