fix bug in case-sens vs. case-insens find-string for text%
fix bug in case-sens vs. case-insens find-string for text%

svn: r14460

mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket,mafagafogigante/racket