Merge pull request #15948 from Snuffleupagus/bug-1811668

Tweak `adjustType1ToUnicode` for fonts with a predefined *named* encoding (bug 1811668, PR 14050 follow-up)

src/core/fonts.js

@@ -201,7 +201,7 @@ function adjustType1ToUnicode(properties, builtInEncoding) {
   for (const charCode in builtInEncoding) {
     if (properties.hasEncoding) {
       if (
-        properties.differences.length === 0 ||
+        properties.baseEncodingName ||
         properties.differences[charCode] !== undefined
       ) {
         continue; // The font dictionary has an `Encoding`/`Differences` entry.

test/pdfs/.gitignore

@@ -399,6 +399,7 @@
 !issue4461.pdf
 !issue4573.pdf
 !issue4722.pdf
+!bug1811668_reduced.pdf
 !issue4800.pdf
 !issue9243.pdf
 !issue13147.pdf

test/test_manifest.json

@@ -1006,6 +1006,12 @@
        "lastPage": 1,
        "type": "eq"
     },
+    {  "id": "bug1811668",
+       "file": "pdfs/bug1811668_reduced.pdf",
+       "md5": "87aa65d89aa0682cbe7b87152b884495",
+       "rounds": 1,
+       "type": "text"
+    },
     {  "id": "issue8092",
        "file": "pdfs/issue8092.pdf",
        "md5": "e4f3376b35fd132580246c3db1fbd738",