> Note, though, that org-set-tags-command already supports completing > multiple tags through org-tags-completion-function, which it passes as > the COLLECTION argument to completing-read. In order to see that in > action, you may need to tell the completion library you use to fall back > to the built-in completing-read. As an example, I use Helm and have > this in my configuration: > > (add-to-list 'helm-completing-read-handlers-alist > '(org-set-tags-command)) >
I looked and helm-org does include a similar adjustment to make it work correctly: https://github.com/emacs-helm/helm-org/blob/b7a18dfc17e8b933956d61d68c435eee03a96c24/helm-org.el#L490-L523 My patch aims to get you completion with the default completion and also for any framework that complies to it out of the box. Without my patch (and without helm-org) you don't get completion after the first tag I think.
