fix: Double recursive loops can cause server lockup on deeply nested docs (#5222)

server/utils/parseDocumentIds.test.ts

@@ -18,6 +18,22 @@ it("should return an array of document ids", () => {
   expect(result[1]).toBe("test-123456");
 });
 
+it("should return deeply nested link document ids", () => {
+  const result = parseDocumentIds(`# Header
+  
+  [internal](http://app.getoutline.com/doc/test-456733)
+
+  More text 
+
+- one
+  - two
+    - three [internal](/doc/test-123456#heading-anchor)
+  `);
+  expect(result.length).toBe(2);
+  expect(result[0]).toBe("test-456733");
+  expect(result[1]).toBe("test-123456");
+});
+
 it("should not return duplicate document ids", () => {
   expect(parseDocumentIds(`# Header`).length).toBe(0);
   const result = parseDocumentIds(`# Header