I added this line to my affix file. But it has no effect on spell checker.
IGNORE <U-200C>
where is the UTF-8 encoded U-200C ZWNJ
I found this suggestion here...
https://bugs.documentfoundation.org/show_bug.cgi?id=60427
What is the correct way to ignore zero width non joiner in hunspell affix file?
From my research, the character after the IGNORE + space, is the encoded character in UTF-8. Not a representation of the character, but the character itself.
There may be other possible valid representations in the file.