chore(vscode): update to 1.53.2

These conflicts will be resolved in the following commits. We do it this way so
that PR review is possible.

lib/vscode/src/vs/editor/contrib/documentSymbols/documentSymbols.ts

@@ -0,0 +1,38 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { URI } from 'vs/base/common/uri';
+import { ITextModel } from 'vs/editor/common/model';
+import { DocumentSymbol } from 'vs/editor/common/modes';
+import { IModelService } from 'vs/editor/common/services/modelService';
+import { CancellationToken } from 'vs/base/common/cancellation';
+import { ITextModelService } from 'vs/editor/common/services/resolverService';
+import { OutlineModel } from 'vs/editor/contrib/documentSymbols/outlineModel';
+import { CommandsRegistry } from 'vs/platform/commands/common/commands';
+import { assertType } from 'vs/base/common/types';
+
+export async function getDocumentSymbols(document: ITextModel, flat: boolean, token: CancellationToken): Promise<DocumentSymbol[]> {
+	const model = await OutlineModel.create(document, token);
+	return flat
+		? model.asListOfDocumentSymbols()
+		: model.getTopLevelSymbols();
+}
+
+CommandsRegistry.registerCommand('_executeDocumentSymbolProvider', async function (accessor, ...args) {
+	const [resource] = args;
+	assertType(URI.isUri(resource));
+
+	const model = accessor.get(IModelService).getModel(resource);
+	if (model) {
+		return getDocumentSymbols(model, false, CancellationToken.None);
+	}
+
+	const reference = await accessor.get(ITextModelService).createModelReference(resource);
+	try {
+		return await getDocumentSymbols(reference.object.textEditorModel, false, CancellationToken.None);
+	} finally {
+		reference.dispose();
+	}
+});