* helm.el (helm-toggle-visible-mark): Issue #428 don't switch to next source when marking last candidate of current source.
* helm-grep.el (helm-grep-prepare-candidates): Issue #421 Reenable searching in a whole directory with plain grep removed by error.
Merge branch 'master' of github.com:emacs-helm/helm
* helm-files.el (helm-substitute-in-filename, helm-ff-auto-expand-to-home-or-root): Issue #424 attempt to fix regexp for unc paths on Windows.