[VSCodeSweeper MVP — test only] Can't hover on top few pixels of editor

src/vs/editor/browser/viewParts/scrollDecoration/scrollDecoration.css

@@ -8,5 +8,6 @@
 	top: 0;
 	left: 0;
 	height: 6px;
+	pointer-events: none;
 	box-shadow: var(--vscode-scrollbar-shadow) 0 6px 6px -6px inset;
 }

src/vs/editor/test/node/scrollDecoration.test.ts

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import assert from 'assert';
+import { readFileSync } from 'fs';
+import { join } from '../../../base/common/path.js';
+import { FileAccess } from '../../../base/common/network.js';
+import { ensureNoDisposablesAreLeakedInTestSuite } from '../../../base/test/common/utils.js';
+
+suite('ScrollDecoration', () => {
+	ensureNoDisposablesAreLeakedInTestSuite();
+
+	test('scroll-decoration CSS should have pointer-events: none to not block hover on top editor pixels', () => {
+		const cssDir = FileAccess.asFileUri('vs/editor/browser/viewParts/scrollDecoration').fsPath;
+		const cssPath = join(cssDir, 'scrollDecoration.css');
+		const cssContent = readFileSync(cssPath, 'utf8');
+		assert.ok(
+			cssContent.includes('pointer-events: none'),
+			'scroll-decoration.css must include "pointer-events: none" so the decorative shadow element does not block pointer events on the top pixels of the editor'
+		);
+	});
+});