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what i did was to override the process_vote method and change the line which says:

score_delta = vote.cancel()
response_data['count'] = post.score + score_delta
response_data['status'] = 1 #this means "cancel"

to this:

before_vote = vote.vote

if (before_vote<0 and vote_direction == 'up') or (before_vote>0 and vote_direction == 'down'):
    score_delta = vote.cancel()
    response_data['count'] = post.score + score_delta
    response_data['status'] = 1 #this means "cancel"