Merge pull request #11020 from Snuffleupagus/issue-11016

Add a work-around, in `glyphlist.js`, for bad PDF generators which use a non-standard `/f_f` string in the `Encoding` dictionary when referring to the ff ligature (issue 11016)

src/core/glyphlist.js

@@ -1826,6 +1826,7 @@ var getGlyphsUnicode = getLookupTableFactory(function (t) {
   t['feicoptic'] = 0x03E5;
   t['female'] = 0x2640;
   t['ff'] = 0xFB00;
+  t['f_f'] = 0xFB00; // Fixes issue 11016.
   t['ffi'] = 0xFB03;
   t['ffl'] = 0xFB04;
   t['fi'] = 0xFB01;

test/pdfs/.gitignore

@@ -79,6 +79,7 @@
 !issue10529.pdf
 !issue10542_reduced.pdf
 !issue10665_reduced.pdf
+!issue11016_reduced.pdf
 !bad-PageLabels.pdf
 !decodeACSuccessive.pdf
 !filled-background.pdf

test/test_manifest.json

@@ -39,6 +39,13 @@
        "lastPage": 1,
        "type": "text"
     },
+    {  "id": "issue11016",
+       "file": "pdfs/issue11016_reduced.pdf",
+       "md5": "b75578bd052d2e6acdcc85b615eab6b1",
+       "rounds": 1,
+       "link": false,
+       "type": "text"
+    },
     {  "id": "issue1293",
        "file": "pdfs/issue1293r.pdf",
        "md5": "4a098f5051f34fab036f5bbe88f8deef",