fix #104110.

src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts

@@ -864,7 +864,7 @@ export class NotebookEditorWidget extends Disposable implements INotebookEditor
 				return;
 			}
 
-			this._webview?.updateViewScrollTop(-e.scrollTop, []);
+			this._webview?.updateViewScrollTop(-e.scrollTop, true, []);
 			this._webviewTransparentCover!.style.top = `${e.scrollTop}px`;
 		}));
 
@@ -912,7 +912,7 @@ export class NotebookEditorWidget extends Disposable implements INotebookEditor
 					removedItems.forEach(output => this._webview?.removeInset(output));
 
 					if (updateItems.length) {
-						this._webview?.updateViewScrollTop(-scrollTop, updateItems);
+						this._webview?.updateViewScrollTop(-scrollTop, false, updateItems);
 					}
 				}
 			});
@@ -1535,7 +1535,7 @@ export class NotebookEditorWidget extends Disposable implements INotebookEditor
 			const cellTop = this._list?.getAbsoluteTopOfElement(cell) || 0;
 			const scrollTop = this._list?.scrollTop || 0;
 
-			this._webview!.updateViewScrollTop(-scrollTop, [{ cell: cell, output: output, cellTop: cellTop }]);
+			this._webview!.updateViewScrollTop(-scrollTop, true, [{ cell: cell, output: output, cellTop: cellTop }]);
 		}
 	}
 

src/vs/workbench/contrib/notebook/browser/view/renderers/backLayerWebView.ts

@@ -107,6 +107,7 @@ export interface IContentWidgetTopRequest {
 export interface IViewScrollTopRequestMessage {
 	type: 'view-scroll';
 	top?: number;
+	forceDisplay: boolean;
 	widgets: IContentWidgetTopRequest[];
 	version: number;
 }
@@ -591,7 +592,7 @@ ${loaderJs}
 		return true;
 	}
 
-	updateViewScrollTop(top: number, items: { cell: CodeCellViewModel, output: IProcessedOutput, cellTop: number }[]) {
+	updateViewScrollTop(top: number, forceDisplay: boolean, items: { cell: CodeCellViewModel, output: IProcessedOutput, cellTop: number }[]) {
 		if (this._disposed) {
 			return;
 		}
@@ -616,6 +617,7 @@ ${loaderJs}
 			top,
 			type: 'view-scroll',
 			version: version++,
+			forceDisplay,
 			widgets: widgets
 		});
 	}

src/vs/workbench/contrib/notebook/browser/view/renderers/webviewPreloads.ts

@@ -413,7 +413,9 @@ function webviewPreloads() {
 					for (let i = 0; i < event.data.widgets.length; i++) {
 						const widget = document.getElementById(event.data.widgets[i].id)!;
 						widget.style.top = event.data.widgets[i].top + 'px';
-						widget.parentElement!.style.display = 'block';
+						if (event.data.forceDisplay) {
+							widget.parentElement!.style.display = 'block';
+						}
 					}
 					break;
 				}