Merge pull request #13764 from Snuffleupagus/issue-13748

XFA - Add a missing method to `XFAAttribute`, to prevent breaking errors (issue 13748)

src/core/xfa/xfa_object.js

@@ -745,6 +745,10 @@ class XFAAttribute {
     return true;
   }
 
+  [$getDataValue]() {
+    return this[$content].trim();
+  }
+
   [$setValue](value) {
     value = value.value || "";
     this[$content] = value.toString();

test/pdfs/issue13748.pdf.link

@@ -0,0 +1 @@
+https://github.com/mozilla/pdf.js/files/6849364/IFT-3R.7._v1-1E.pdf

test/test_manifest.json

@@ -1347,6 +1347,15 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue13748",
+       "file": "pdfs/issue13748.pdf",
+       "md5": "de0e4dde2890b9ff145a3184831bae02",
+       "link": true,
+       "rounds": 1,
+       "lastPage": 1,
+       "enableXfa": true,
+       "type": "eq"
+    },
     {  "id": "issue13756",
        "file": "pdfs/issue13756.pdf",
        "md5": "67040c6df3b5039fcbc81bf63b7c7f98",