Clear search results on search panel close

apps/red-ui/src/app/screens/file/pdf-viewer/pdf-viewer.component.ts

@@ -150,6 +150,18 @@ export class PdfViewerComponent implements OnInit, AfterViewInit, OnChanges {
                 }
             });
 
+            instance.iframeWindow.addEventListener('visibilityChanged', (event: any) => {
+                if (event.detail.element === 'searchPanel') {
+                    const inputElement = instance.iframeWindow.document.getElementById('SearchPanel__input') as HTMLInputElement;
+                    setTimeout(() => {
+                        inputElement.value = '';
+                    }, 0);
+                    if (!event.detail.isVisible) {
+                        instance.docViewer.clearSearchResults();
+                    }
+                }
+            });
+
             this._loadDocument();
         });
     }