Don't map glyphs to the HANGUL FILLER (0x3164) Unicode location (issue 8424)

*This patch follows a similar pattern as previous ones, by skipping certain problematic Unicode locations.*

According to http://searchfox.org/mozilla-central/rev/6c2dbacbba1d58b8679cee700fd0a54189e0cf1b/gfx/harfbuzz/src/hb-unicode-private.hh#136, it seems that the HANGUL FILLER (0x3164) location is "special".

Fixes 8424.

src/core/fonts.js

@@ -499,6 +499,7 @@ var ProblematicCharRanges = new Int32Array([
   0x205F, 0x2070,
   0x25CC, 0x25CD,
   0x3000, 0x3001,
+  0x3164, 0x3165,
   // Chars that is used in complex-script shaping.
   0xAA60, 0xAA80,
   // Specials Unicode block.

test/pdfs/.gitignore

@@ -50,6 +50,7 @@
 !issue8061.pdf
 !issue8088.pdf
 !issue8125.pdf
+!issue8424.pdf
 !bad-PageLabels.pdf
 !filled-background.pdf
 !ArabicCIDTrueType.pdf

test/test_manifest.json

@@ -1256,6 +1256,13 @@
        "link": true,
        "type": "eq"
     },
+    {  "id": "issue8424",
+       "file": "pdfs/issue8424.pdf",
+       "md5": "3de1ea4c085e8fe8e156153418058955",
+       "rounds": 1,
+       "link": false,
+       "type": "eq"
+    },
     {  "id": "type4psfunc",
       "file": "pdfs/type4psfunc.pdf",
       "md5": "7e6027a02ff78577f74dccdf84e37189",