Wrong character guides colour with f90-mode-hook in client sessions

[agreselin]

With the following init.el,

(package-initialize)
(setq highlight-indent-guides-method 'character)
(add-hook 'f90-mode-hook 'highlight-indent-guides-mode)

after launching a client frame indentation guides are shown in black instead of grey:

If f90-mode-hook is replaced with prog-mode-hook, indentation guides get the right colour:

How to reproduce

With the init.el above, run emacs --daemon && emacsclient -c file.f90.

This issue only happens in emacsclient sessions. Launching Emacs with emacs file.f90 I get the right colour even with f90-mode-hook in my init file.

I'm on Emacs 26.2, highlight-indent-guides v. 20190108.3.

[agreselin]

Update

The behaviour I'm getting is quite weird: I tried to work around the issue by enabling highlight-indent-guides-mode from the prog-mode-hook and disabling it with (highlight-indent-guides-mode -1) in the hook of modes where I don't want it. It works for LaTeX, shell, Markdown and other mode hooks, but calling (highlight-indent-guides-mode -1) from emacs-lisp-mode-hook got me back the black guides again.

The thing that works best seems to be just adding (highlight-indent-guides-mode) to init.el. 🤔

Btw, thank you for your great work :-)

[agreselin]

This looks like a better solution:

(defun highlight-indent-guides-auto-set-faces-with-frame (frame)
  (with-selected-frame frame
    (highlight-indent-guides-auto-set-faces)))
(if (daemonp)
    (add-hook 'after-make-frame-functions #'highlight-indent-guides-auto-set-faces-with-frame))

[DarthFennec]

Hm ... I'm having trouble reproducing this on my macos, I don't think the package I'm using supports the -c option for emacsclient. I'll have to take a closer look later on my linux system. Thanks for letting me know!