Fix the xref table with the values we've at the beginning of a xref stream (bug 1978317)

src/core/xref.js

@@ -961,6 +961,15 @@ class XRef {
         );
       }
       nums[i] = num;
+
+      // The entry in the xref table is the object number followed by the index.
+      // So if index (gen number) is not the same as the index (i), we fix it
+      // (fixes bug 1978317).
+      const entry = this.getEntry(num);
+      if (entry?.offset === tableOffset && entry.gen !== i) {
+        entry.gen = i;
+      }
+
       offsets[i] = offset;
     }
 

test/pdfs/.gitignore

@@ -735,3 +735,4 @@
 !issue20102.pdf
 !issue20065.pdf
 !bug1708041.pdf
+!bug1978317.pdf

test/test_manifest.json

@@ -12221,5 +12221,12 @@
     "rounds": 1,
     "disableFontFace": true,
     "type": "eq"
+  },
+  {
+    "id": "bug1978317",
+    "file": "pdfs/bug1978317.pdf",
+    "md5": "ae4f643ee9bb0fd725277a9d1e0fb1df",
+    "rounds": 1,
+    "type": "load"
   }
 ]