fix #119767.

src/vs/workbench/contrib/notebook/browser/view/notebookCellList.ts

@@ -693,6 +693,9 @@ export class NotebookCellList extends WorkbenchList<CellViewModel> implements ID
 		super.setSelection(indexes, browserEvent);
 	}
 
+	/**
+	 * The range will be revealed with as little scrolling as possible.
+	 */
 	revealElementsInView(range: ICellRange) {
 		const startIndex = this._getViewIndexUpperBound2(range.start);
 
@@ -713,6 +716,11 @@ export class NotebookCellList extends WorkbenchList<CellViewModel> implements ID
 			const endElementTop = this.view.elementTop(endIndex);
 			const endElementHeight = this.view.elementHeight(endIndex);
 
+			if (endElementTop + endElementHeight <= wrapperBottom) {
+				// fully visible
+				return;
+			}
+
 			if (endElementTop >= wrapperBottom) {
 				return this._revealInternal(endIndex, false, CellRevealPosition.Bottom);
 			}