I think I found the problem and have a fix!

Long story short, I modified my helm-completing-read-handlers-alist

and added an entry:

(add-to-list 'helm-completing-read-handlers-alist
    `(org-set-tags-command . helm-org-completing-read-tags)
)

I have all the gory details here:

https://github.com/emacs-helm/helm/issues/2183

Thanks all for your help, hope this helps someone else too :)

--Nate

On Sat, Aug 10, 2019 at 4:01 PM Nathan Neff <nathan.neff@gmail.com> wrote:

On Sat, Aug 10, 2019 at 3:44 PM Nathan Neff <nathan.neff@gmail.com> wrote:

Hello all,

I created a VM, installed Emacs 26.2 fresh, and installed various versions

of org-mode using the tar.gz files from https://orgmode.org/

I replaced org-mode in /usr/share/emacs/26.2/lisp/org with various older

versions until I found the version of org-mode that breaks the helm tags completion.

I found that the latest version of org where the feature works is Org-mode version 9.1.9.

Oops - my aplogies - I assumed that the org-versions stopped at 9.1.9.  I tested Org 9.1.14 which (to

my knowledge) is the last of the 9.1.X versions, and Org 9.1.14 works correctly.

I tested Org version 9.2 and Org version 9.2 is the version that breaks the tags functionality

from Helm.

I will spelunk around in the code to see what might have changed the behavior - if anyone has

suggestions or doesn't have this problem with an older version of org, please let me know - it could

easily be something that I have set incorrectly.

Thanks,

--Nate

On Fri, Aug 9, 2019 at 4:28 PM Nathan Neff <nathan.neff@gmail.com> wrote:

Hello all,

I'm hitting this problem with Org-mode 9.2.5:

https://groups.google.com/forum/#!topic/emacs-helm/tA6cn6TUdRY

Problem synopsis:  When I use org-set-tags on a heading

with no tags, Helm gives me the correct prompt w/a list of all my tags.

After I have entered a single tag, then no more Helm suggestions are

offered.  This is the bug, and it was fixed at some point.

Helm + org-mode *work correctly* when I run emacs using

the elpa/helm-20190726/emacs-helm.sh script which comes with Helm

for debugging purposes.  I notice that the org-version in the *working* example

is 9.1.9 (which is, I presume) the stock org-mode that comes with Emacs.

I have reproduced this problem on both Linux and OSX.

Can anyone suggest a next step to take?

Thanks,

--Nate