fixed the 'find the word behind the insertion point' function for racket-mode completion   closes PR 11800
fixed the 'find the word behind the insertion point' function for racket-mode completion
  closes PR 11800

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