fix #104176.

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

@@ -399,6 +399,10 @@ export class NotebookService extends Disposable implements INotebookService, ICu
 					return false;
 				}
 
+				if (!viewModel.metadata.editable) {
+					return false;
+				}
+
 				const currCellIndex = viewModel.getCellIndex(activeCell);
 
 				let topPastedCell: CellViewModel | undefined = undefined;
@@ -442,6 +446,10 @@ export class NotebookService extends Disposable implements INotebookService, ICu
 					return false;
 				}
 
+				if (!viewModel.metadata.editable) {
+					return false;
+				}
+
 				const clipboardService = accessor.get<IClipboardService>(IClipboardService);
 				const notebookService = accessor.get<INotebookService>(INotebookService);
 				clipboardService.writeText(activeCell.getText());

src/vs/workbench/contrib/notebook/browser/viewModel/notebookViewModel.ts

@@ -1070,6 +1070,10 @@ export class NotebookViewModel extends Disposable implements EditorFoldingStateD
 	}
 
 	async undo() {
+		if (!this.metadata.editable) {
+			return;
+		}
+
 		const editStack = this._undoService.getElements(this.uri);
 		const element = editStack.past.length ? editStack.past[editStack.past.length - 1] : undefined;
 
@@ -1083,6 +1087,10 @@ export class NotebookViewModel extends Disposable implements EditorFoldingStateD
 	}
 
 	async redo() {
+		if (!this.metadata.editable) {
+			return;
+		}
+
 		const editStack = this._undoService.getElements(this.uri);
 		const element = editStack.future[0];