Eli Zaretskii <eliz@gnu.org> writes:

>> It’s from the issue https://github.com/bbatsov/helm-projectile/issues/154, 
>> 
>> “[bug] `helm-projectile-find-file' empty candidate when there is "*.iso/" folder”
>> 
>> Through the traceback I attached in first mail, the dbus event cause a unexpected return value in line 
>> 
>> https://github.com/emacs-helm/helm/blob/26d4e9e4d38a143d7dfb2fe206eacbc326944532/helm.el#L4649,
>> 
>> Then it’s function will show nothing.
>
> Is this because helm uses while-no-input or throw-on-input?  If so,
> does it help to bind while-no-input-ignore-events to a list that
> includes this kind of dbus events?

This doesn't help (yet), because dbus-event isn't handled via
while-no-input-ignore-events. The appended patch extends this for
dbus-event and file-notify. The following adapted test works then:

--8<---------------cut here---------------start------------->8---
# emacs --batch --eval "(message \"%s\" (catch 'input (let ((while-no-input-ignore-events (cons 'dbus-event while-no-input-ignore-events)) (throw-on-input 'input)) (expand-file-name \"a.iso/b\" \"/\"))))"
--8<---------------cut here---------------end--------------->8---

Is it OK to push this to the master branch (plus doc adaptions)?

Best regards, Michael.