Suggest linebreak. Fix #79840

src/vs/base/common/htmlContent.ts

@@ -23,7 +23,10 @@ export class MarkdownString implements IMarkdownString {
 
 	appendText(value: string): MarkdownString {
 		// escape markdown syntax tokens: http://daringfireball.net/projects/markdown/syntax#backslash
-		this.value += value.replace(/[\\`*_{}[\]()#+\-.!]/g, '\\$&');
+		this.value += value
+			.replace(/[\\`*_{}[\]()#+\-.!]/g, '\\$&')
+			.replace('\n', '\n\n');
+
 		return this;
 	}
 

src/vs/base/test/common/markdownString.test.ts

@@ -0,0 +1,19 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as assert from 'assert';
+import { MarkdownString } from 'vs/base/common/htmlContent';
+
+suite('markdownString', () => {
+
+	test('escape', () => {
+
+		const mds = new MarkdownString();
+
+		mds.appendText('# foo\n*bar*');
+
+		assert.equal(mds.value, '\\# foo\n\n\\*bar\\*');
+	});
+});