in res_text.c r2070 the function "fz_debugtext" outputs a character with printf("<g ucs=\"%c\" ... but the character could be '"' it MUST output a string which is either the character or its xml escaped value, which would be """ in this example.
duplicate of 691669 which is marked fixed, but it *** This bug has been marked as a duplicate of bug 691559 ***
The function fz_debugtext calls isxmlmeta to test whether to print a character verbatim (only for printable ascii non-xml-meta-characters) or with the U+ escaped unicode syntax. (") is tested as a meta character.