nes: test: cover Windows paths with spaces

Add Windows-only assertions for custom patch prediction and response resolution so the Copilot Windows CI job can validate issue #325491 with native URI behavior.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: c3a3ef53-5b3f-4816-a695-a90acc9caa11

Author: ulugbekna

extensions/copilot/src/extension/xtab/test/node/xtabPatchResponseHandler.spec.ts

@@ -9,6 +9,8 @@ import { NoNextEditReason, StreamedEdit } from '../../../../platform/inlineEdits
 import { TestLogService } from '../../../../platform/testing/common/testLogService';
 import { AsyncIterUtils } from '../../../../util/common/asyncIterableUtils';
 import { AsyncIterableSource } from '../../../../util/vs/base/common/async';
+import { isWindows } from '../../../../util/vs/base/common/platform';
+import { URI } from '../../../../util/vs/base/common/uri';
 import { LineReplacement } from '../../../../util/vs/editor/common/core/edits/lineEdit';
 import { Position } from '../../../../util/vs/editor/common/core/position';
 import { LineRange } from '../../../../util/vs/editor/common/core/ranges/lineRange';
@@ -97,6 +99,37 @@ relative/path/to/another_file.js:42
 		expect(patches).toEqual(patchText);
 	});
 
+	it.skipIf(!isWindows)('applies a patch for a Windows path whose parent folder contains a space', async () => {
+		const workspaceRoot = URI.file('C:\\workspace');
+		const documentId = DocumentId.create(URI.file('C:\\workspace\\space folder\\test.py').toString());
+		const document = new CurrentDocument(new StringText('def my_function'), new Position(1, 16));
+		const lines = AsyncIterUtils.fromArray([
+			'space folder/test.py:0',
+			'-def my_function',
+			'+def my_function():',
+			'+    pass',
+		]);
+
+		const { edits } = await consumeHandleResponse(
+			lines,
+			document,
+			documentId,
+			workspaceRoot,
+			undefined,
+			new TestLogService(),
+		);
+
+		expect(edits.map(edit => ({
+			targetDocument: edit.targetDocument.toString(),
+			lineRange: edit.edit.lineRange.toString(),
+			newLines: edit.edit.newLines,
+		}))).toEqual([{
+			targetDocument: 'file:///c%3A/workspace/space%20folder/test.py',
+			lineRange: '[1,2)',
+			newLines: ['def my_function():', '    pass'],
+		}]);
+	});
+
 	it('discard a patch if no valid header', async () => {
 		const patchText = `myFile.ts:
 +New line 1

extensions/copilot/src/extension/xtab/test/node/xtabProvider.spec.ts

@@ -30,6 +30,7 @@ import { DeferredPromise } from '../../../../util/vs/base/common/async';
 import { CancellationToken, CancellationTokenSource } from '../../../../util/vs/base/common/cancellation';
 import { Emitter, Event } from '../../../../util/vs/base/common/event';
 import { DisposableStore } from '../../../../util/vs/base/common/lifecycle';
+import { isWindows } from '../../../../util/vs/base/common/platform';
 import { URI } from '../../../../util/vs/base/common/uri';
 import { LineEdit, LineReplacement } from '../../../../util/vs/editor/common/core/edits/lineEdit';
 import { StringEdit, StringReplacement } from '../../../../util/vs/editor/common/core/edits/stringEdit';
@@ -523,6 +524,23 @@ describe('getPredictionContents', () => {
 		expect(result.endsWith(':')).toBe(true);
 	});
 
+	it.skipIf(!isWindows)('preserves spaces in a workspace-relative Windows path', () => {
+		const lines = ['def my_function'];
+		const text = new StringText(lines.join('\n'));
+		const workspaceRoot = URI.file('C:\\workspace');
+		const doc = new StatelessNextEditDocument(
+			DocumentId.create(URI.file('C:\\workspace\\space folder\\test.py').toString()),
+			workspaceRoot,
+			LanguageId.create('python'),
+			lines,
+			LineEdit.empty,
+			text,
+			new Edits(StringEdit, []),
+		);
+
+		expect(call(lines, ResponseFormat.CustomDiffPatch, { doc })).toBe('space folder/test.py:');
+	});
+
 	it('returns correct content for CustomDiffPatch without workspace root', () => {
 		const result = call(editWindowLines, ResponseFormat.CustomDiffPatch);
 		expect(result.endsWith(':')).toBe(true);