Merge branch 'ph/345019/fixMultiNewLineRegex' into 'master'

Fixes multiple new line suggestions not escaping correctly

See merge request gitlab-org/gitlab!74090

app/assets/javascripts/lib/utils/text_markdown.js

@@ -233,7 +233,7 @@ export function insertMarkdownText({
     }
   } else if (tag.indexOf(textPlaceholder) > -1) {
     textToInsert = tag.replace(textPlaceholder, () =>
-      selected.replace(/\\n/g, '\n').replace('%br', '\\n'),
+      selected.replace(/\\n/g, '\n').replace(/%br/g, '\\n'),
     );
   } else {
     textToInsert = String(startChar) + tag + selected + (wrap ? tag : '');

spec/frontend/lib/utils/text_markdown_spec.js

@@ -100,11 +100,11 @@ describe('init markdown', () => {
           text: textArea.value,
           tag: '```suggestion:-0+0\n{text}\n```',
           blockTag: true,
-          selected: '# Does not parse the %br currently.',
+          selected: '# Does not %br parse the %br currently.',
           wrap: false,
         });
 
-        expect(textArea.value).toContain('# Does not parse the \\n currently.');
+        expect(textArea.value).toContain('# Does not \\n parse the \\n currently.');
       });
 
       it('inserts the tag on the same line if the current line only contains spaces', () => {