differentiate between pick and preview, https://github.com/microsoft/vscode/issues/96489

src/vs/workbench/contrib/codeEditor/browser/quickaccess/gotoSymbolQuickAccess.ts

@@ -12,7 +12,7 @@ import { Registry } from 'vs/platform/registry/common/platform';
 import { IQuickAccessRegistry, Extensions as QuickaccessExtensions } from 'vs/platform/quickinput/common/quickAccess';
 import { AbstractGotoSymbolQuickAccessProvider, IGotoSymbolQuickPickItem } from 'vs/editor/contrib/quickAccess/gotoSymbolQuickAccess';
 import { IConfigurationService } from 'vs/platform/configuration/common/configuration';
-import { IWorkbenchEditorConfiguration, IEditorPane } from 'vs/workbench/common/editor';
+import { IWorkbenchEditorConfiguration, IEditorPane, IVisibleEditorPane } from 'vs/workbench/common/editor';
 import { ITextModel } from 'vs/editor/common/model';
 import { DisposableStore, IDisposable, toDisposable } from 'vs/base/common/lifecycle';
 import { timeout } from 'vs/base/common/async';
@@ -108,11 +108,13 @@ export class GotoSymbolQuickAccessProvider extends AbstractGotoSymbolQuickAccess
 
 	protected provideWithoutTextEditor(picker: IQuickPick<IGotoSymbolQuickPickItem>): IDisposable {
 		const pane = this.editorService.activeEditorPane;
-		if (!pane || !TableOfContentsProviderRegistry.has(pane.getId())) {
-			//
-			return super.provideWithoutTextEditor(picker);
+		if (pane && TableOfContentsProviderRegistry.has(pane.getId())) {
+			return this.doGetTableOfContentsPicks(picker, pane);
 		}
+		return super.provideWithoutTextEditor(picker);
+	}
 
+	private doGetTableOfContentsPicks(picker: IQuickPick<IGotoSymbolQuickPickItem>, pane: IVisibleEditorPane): IDisposable {
 		const provider = TableOfContentsProviderRegistry.get(pane.getId())!;
 		const cts = new CancellationTokenSource();
 
@@ -144,7 +146,7 @@ export class GotoSymbolQuickAccessProvider extends AbstractGotoSymbolQuickAccess
 			disposables.add(picker.onDidAccept(() => {
 				picker.hide();
 				const [entry] = picker.selectedItems;
-				entries[entry.index]?.reveal();
+				entries[entry.index]?.pick();
 			}));
 
 			const updatePickerItems = () => {
@@ -177,14 +179,11 @@ export class GotoSymbolQuickAccessProvider extends AbstractGotoSymbolQuickAccess
 			let ignoreFirstActiveEvent = true;
 			disposables.add(picker.onDidChangeActive(() => {
 				const [entry] = picker.activeItems;
-
 				if (entry && entries[entry.index]) {
-					if (ignoreFirstActiveEvent) {
-						ignoreFirstActiveEvent = false;
-						return;
+					if (!ignoreFirstActiveEvent) {
+						entries[entry.index]?.preview();
 					}
-
-					entries[entry.index]?.reveal();
+					ignoreFirstActiveEvent = false;
 				}
 			}));
 
@@ -238,7 +237,8 @@ export interface ITableOfContentsEntry {
 	label: string;
 	detail?: string;
 	description?: string;
-	reveal(): any;
+	pick(): any;
+	preview(): any;
 }
 
 export interface ITableOfContentsProvider<T extends IEditorPane = IEditorPane> {

src/vs/workbench/contrib/notebook/browser/contrib/toc/tocProvider.ts

@@ -14,7 +14,7 @@ TableOfContentsProviderRegistry.register(NotebookEditor.ID, new class implements
 			return undefined;
 		}
 		// return an entry per markdown header
-		const editorWidget = editor.getControl();
+		const notebookWidget = editor.getControl();
 		const result: ITableOfContentsEntry[] = [];
 		for (let cell of editor.viewModel.viewCells) {
 			const content = cell.getText();
@@ -28,10 +28,14 @@ TableOfContentsProviderRegistry.register(NotebookEditor.ID, new class implements
 					result.push({
 						icon: cell.cellKind === CellKind.Markdown ? Codicon.markdown : Codicon.code,
 						label: matches[j].replace(/^[ \t]*(\#+)/, ''),
-						reveal: () => {
-							editorWidget.revealInCenterIfOutsideViewport(cell);
-							editorWidget.selectElement(cell);
-							// editor.focusNotebookCell(cell, 'container');
+						pick() {
+							notebookWidget.revealInCenterIfOutsideViewport(cell);
+							notebookWidget.selectElement(cell);
+							notebookWidget.focusNotebookCell(cell, 'container');
+						},
+						preview() {
+							notebookWidget.revealInCenterIfOutsideViewport(cell);
+							notebookWidget.selectElement(cell);
 						}
 					});
 				}