* helm-files.el (helm-ff-transform-fname-for-completion): regexp-quote also bn when cand is a directory (#534).
* helm-files.el (helm-ff-transform-fname-for-completion): concat after 1 char and quote single chars (#534).
* helm-utils.el (helm--mapconcat-candidate): quote single char.
* helm.el: Disable blink-matching-paren.
* helm-files.el (helm-ff-set-pattern): string-match should match pattern not regexp.