When no document symbol provider use the folding model for the sticky scroll

src/vs/editor/contrib/stickyScroll/browser/stickyScrollController.ts

@@ -33,6 +33,8 @@ export class StickyScrollController extends Disposable implements IEditorContrib
 		this._stickyLineCandidateProvider = new StickyLineCandidateProvider(this._editor, _languageFeaturesService);
 		this._widgetState = new StickyScrollWidgetState([], 0);
 
+		this._register(this._stickyScrollWidget);
+		this._register(this._stickyLineCandidateProvider);
 		this._register(this._editor.onDidChangeConfiguration(e => {
 			if (e.hasChanged(EditorOption.stickyScroll)) {
 				this.readConfiguration();

src/vs/editor/contrib/stickyScroll/browser/stickyScrollProvider.ts

@@ -13,6 +13,8 @@ import { RunOnceScheduler } from 'vs/base/common/async';
 import { Range } from 'vs/editor/common/core/range';
 import { Emitter } from 'vs/base/common/event';
 import { binarySearch } from 'vs/base/common/arrays';
+import { FoldingController } from 'vs/editor/contrib/folding/browser/folding';
+import { FoldingModel } from 'vs/editor/contrib/folding/browser/foldingModel';
 
 export class StickyRange {
 	constructor(
@@ -92,7 +94,24 @@ export class StickyLineCandidateProvider extends Disposable {
 			if (token.isCancellationRequested) {
 				return;
 			}
-			this._outlineModel = StickyOutlineElement.fromOutlineModel(outlineModel, -1);
+			if (outlineModel.children.size !== 0) {
+				this._outlineModel = StickyOutlineElement.fromOutlineModel(outlineModel, -1);
+			} else {
+				const foldingController = FoldingController.get(this._editor);
+				const foldingModel = await foldingController?.getFoldingModel();
+				if (token.isCancellationRequested) {
+					return;
+				}
+				if (foldingModel && foldingModel.regions.length !== 0) {
+					this._outlineModel = StickyOutlineElement.fromFoldingModel(foldingModel);
+				} else {
+					this._outlineModel = new StickyOutlineElement(
+						new StickyRange(-1, -1),
+						[],
+						undefined
+					);
+				}
+			}
 			this._modelVersionId = modelVersionId;
 		}
 	}
@@ -191,9 +210,44 @@ class StickyOutlineElement {
 		}
 		return new StickyOutlineElement(
 			range,
-			children
+			children,
+			undefined
 		);
 	}
+
+	public static fromFoldingModel(foldingModel: FoldingModel): StickyOutlineElement {
+		const regions = foldingModel.regions;
+		const length = regions.length;
+		let range: StickyRange | undefined;
+		const stackOfParents: StickyRange[] = [];
+
+		const stickyOutlineElement = new StickyOutlineElement(
+			undefined,
+			[],
+			undefined
+		);
+		let parentStickyOutlineElement = stickyOutlineElement;
+
+		for (let i = 0; i < length; i++) {
+			range = new StickyRange(regions.getStartLineNumber(i), regions.getEndLineNumber(i));
+			while (stackOfParents.length !== 0 && (range.startLineNumber < stackOfParents[stackOfParents.length - 1].startLineNumber || range.endLineNumber > stackOfParents[stackOfParents.length - 1].endLineNumber)) {
+				stackOfParents.pop();
+				if (parentStickyOutlineElement.parent !== undefined) {
+					parentStickyOutlineElement = parentStickyOutlineElement.parent;
+				}
+			}
+			const child = new StickyOutlineElement(
+				range,
+				[],
+				parentStickyOutlineElement
+			);
+			parentStickyOutlineElement.children.push(child);
+			parentStickyOutlineElement = child;
+			stackOfParents.push(range);
+		}
+		return stickyOutlineElement;
+	}
+
 	constructor(
 		/**
 		 * Range of line numbers spanned by the current scope
@@ -202,7 +256,11 @@ class StickyOutlineElement {
 		/**
 		 * Must be sorted by start line number
 		*/
-		public readonly children: readonly StickyOutlineElement[],
+		public readonly children: StickyOutlineElement[],
+		/**
+		 * Parent sticky outline element
+		 */
+		public readonly parent: StickyOutlineElement | undefined
 	) {
 	}
 }

src/vs/editor/test/browser/testCodeEditor.ts

@@ -133,7 +133,7 @@ function isTextModel(arg: ITextModel | string | string[] | ITextBufferFactory):
 
 function _withTestCodeEditor(arg: ITextModel | string | string[] | ITextBufferFactory, options: TestCodeEditorInstantiationOptions, callback: (editor: ITestCodeEditor, viewModel: ViewModel, instantiationService: TestInstantiationService) => void): void;
 function _withTestCodeEditor(arg: ITextModel | string | string[] | ITextBufferFactory, options: TestCodeEditorInstantiationOptions, callback: (editor: ITestCodeEditor, viewModel: ViewModel, instantiationService: TestInstantiationService) => Promise<void>): Promise<void>;
-function _withTestCodeEditor(arg: ITextModel | string | string[] | ITextBufferFactory, options: TestCodeEditorInstantiationOptions, callback: (editor: ITestCodeEditor, viewModel: ViewModel, instantiationService: TestInstantiationService) => Promise<void> | void): Promise<void> | void {
+async function _withTestCodeEditor(arg: ITextModel | string | string[] | ITextBufferFactory, options: TestCodeEditorInstantiationOptions, callback: (editor: ITestCodeEditor, viewModel: ViewModel, instantiationService: TestInstantiationService) => Promise<void> | void): Promise<Promise<void> | void> {
 	const disposables = new DisposableStore();
 	const instantiationService = createCodeEditorServices(disposables, options.serviceCollection);
 	delete options.serviceCollection;
@@ -149,12 +149,12 @@ function _withTestCodeEditor(arg: ITextModel | string | string[] | ITextBufferFa
 	const editor = disposables.add(instantiateTestCodeEditor(instantiationService, model, options));
 	const viewModel = editor.getViewModel()!;
 	viewModel.setHasFocus(true);
-	const result = callback(<ITestCodeEditor>editor, editor.getViewModel()!, instantiationService);
-	if (result) {
-		return result.then(() => disposables.dispose());
+	try {
+		const result = callback(<ITestCodeEditor>editor, editor.getViewModel()!, instantiationService);
+		await result;
+	} finally {
+		disposables.dispose();
 	}
-
-	disposables.dispose();
 }
 
 export function createCodeEditorServices(disposables: DisposableStore, services: ServiceCollection = new ServiceCollection()): TestInstantiationService {

src/vs/workbench/test/browser/workbenchTestServices.ts

@@ -194,7 +194,7 @@ export class TestTextResourceEditor extends TextResourceEditor {
 export class TestTextFileEditor extends TextFileEditor {
 
 	protected override createEditorControl(parent: HTMLElement, configuration: any): void {
-		this.editorControl = this.instantiationService.createInstance(TestCodeEditor, parent, configuration, {});
+		this.editorControl = this.instantiationService.createInstance(TestCodeEditor, parent, configuration, { contributions: [] });
 	}
 
 	setSelection(selection: Selection | undefined, reason: EditorPaneSelectionChangeReason): void {