From ff4dae05b0f8349b6277d45e2d282ad893a4b3af Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 11 Apr 2021 12:00:14 +0200
Subject: [PATCH] Ensure that `getStructTree` won't break with
 `disableAutoFetch = true` set (PR 13171 follow-up)

Open http://localhost:8888/web/viewer.html?file=/test/pdfs/pdf.pdf#disableStream=true&disableAutoFetch=true and observe the following message in the console (repeated for each page of the document):
```
Uncaught (in promise)
Object { message: "Missing data [19787293, 19787294)", name: "UnknownErrorException", details: "MissingDataException: Missing data [19787293, 19787294)", stack: "BaseExceptionClosure@http://localhost:8888/src/shared/util.js:458:29\n@http://localhost:8888/src/shared/util.js:462:3\n" }
```
---
 src/core/document.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/core/document.js b/src/core/document.js
index 11830f0b0..27cbede28 100644
--- a/src/core/document.js
+++ b/src/core/document.js
@@ -454,6 +454,13 @@ class Page {
     const structTreeRoot = await this.pdfManager.ensureCatalog(
       "structTreeRoot"
     );
+    return this.pdfManager.ensure(this, "_parseStructTree", [structTreeRoot]);
+  }
+
+  /**
+   * @private
+   */
+  _parseStructTree(structTreeRoot) {
     const tree = new StructTreePage(structTreeRoot, this.pageDict);
     tree.parse();
     return tree;