Take the FirstChar/LastChar properties into account when computing the hash in PartialEvaluator.preEvaluateFont (issue 10665)

Without this some fonts may incorrectly end up with matching `hash`es, thus breaking rendering since we'll not actually try to load/parse some of the fonts.

test/pdfs/.gitignore

@@ -76,6 +76,7 @@
 !issue10388_reduced.pdf
 !issue10438_reduced.pdf
 !issue10529.pdf
+!issue10665_reduced.pdf
 !bad-PageLabels.pdf
 !decodeACSuccessive.pdf
 !filled-background.pdf

test/test_manifest.json

@@ -2564,6 +2564,13 @@
        "link": false,
        "type": "eq"
     },
+    {  "id": "issue10665",
+       "file": "pdfs/issue10665_reduced.pdf",
+       "md5": "4c8938c808153f6b3840e8a5eb68b804",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "issue1466",
       "file": "pdfs/issue1466.pdf",
       "md5": "8a8877432e5bb10cfd50d60488d947bb",