Make issue suggestion work for new PR page (#33035)

Fix #33026

web_src/js/utils.test.ts

@@ -49,6 +49,7 @@ test('parseIssueNewHref', () => {
   expect(parseIssueNewHref('/owner/repo/issues/new')).toEqual({ownerName: 'owner', repoName: 'repo', pathType: 'issues'});
   expect(parseIssueNewHref('/owner/repo/issues/new?query')).toEqual({ownerName: 'owner', repoName: 'repo', pathType: 'issues'});
   expect(parseIssueNewHref('/sub/owner/repo/issues/new#hash')).toEqual({ownerName: 'owner', repoName: 'repo', pathType: 'issues'});
+  expect(parseIssueNewHref('/sub/owner/repo/compare/feature/branch-1...fix/branch-2')).toEqual({ownerName: 'owner', repoName: 'repo', pathType: 'pulls'});
 });
 
 test('parseUrl', () => {

web_src/js/utils.ts

@@ -39,8 +39,9 @@ export function parseIssueHref(href: string): IssuePathInfo {
 
 export function parseIssueNewHref(href: string): IssuePathInfo {
   const path = (href || '').replace(/[#?].*$/, '');
-  const [_, ownerName, repoName, pathType, indexString] = /([^/]+)\/([^/]+)\/(issues|pulls)\/new/.exec(path) || [];
-  return {ownerName, repoName, pathType, indexString};
+  const [_, ownerName, repoName, pathTypeField] = /([^/]+)\/([^/]+)\/(issues\/new|compare\/.+\.\.\.)/.exec(path) || [];
+  const pathType = pathTypeField.startsWith('issues/new') ? 'issues' : 'pulls';
+  return {ownerName, repoName, pathType};
 }
 
 export function parseIssuePageInfo(): IssuePageInfo {