Merge pull request #7447 from Snuffleupagus/buildToUnicode-notdef

Ignore .notdef in the `differences` array when building a fallback `toUnicode` map in `PartialEvaluator_buildToUnicode` (issue 5256)

test/pdfs/.gitignore

@@ -13,6 +13,7 @@
 !issue3214.pdf
 !issue4665.pdf
 !issue4684.pdf
+!issue5256.pdf
 !issue5801.pdf
 !issue5946.pdf
 !issue5972.pdf

test/test_manifest.json

@@ -1401,6 +1401,13 @@
       "link": true,
       "type": "eq"
     },
+    {  "id": "issue5256",
+       "file": "pdfs/issue5256.pdf",
+       "md5": "9383e17ced31f9afc940fb7898df8e68",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "issue6360",
        "file": "pdfs/issue6360.pdf",
        "md5": "58c5455ffd84b1c07ad2d0fa90cd5e26",