Display compatibility issue with company-mode

[john2x]

When fci-mode is enabled and a company-mode auto-complete popup shows up, the first completion item is moved beyond the ruler. See screenshot.

[dgutov]

We'll probably have to fix it in company-mode (company-mode/company-mode#180).

If the situation can be improved on this side, though, that would be even better.

[dgutov]

The problem in the screenshot in the linked company-mode issue is caused by the bug/undefined behavior triggered by this package, described in debbugs:18417.

The problem described here should be somewhat easier to fix, but there's not much point in doing that, I think, until there's a workaround in place for the other problem.

[alpaker]

As I commented in the debbugs thread, I'll try to simplify the implementation so as to avoid undefined behavior in the Emacs display engine. We'll see if that suffices to avoid both problems.

[dgutov]

I've pushed a change that works around one of them, which leaves just the issue with posn-col-row, I think.

[mbrgm]

Is there any progress on this issue?

Edit: fci-mode also breaks auto-complete's quick help.

[hunterboerner]

Status update?

[john2x]

I've encountered another display issue with fci-mode + hideshow-mode. That has prompted me to stop using fci-mode for the moment as there are too many incompatibilities with other modes I'm using (and likely other modes I might use in the future).

Maybe a wiki/FAQ entry for compatibility issues would be useful?

[root42]

Any news on this one? I am using Emacs24 with the usual MELPA packages, and company + fci-mode still don't play nice together.

[eigengrau]

Dupe of #21.

[sukiida]

https://github.com/alpaker/Fill-Column-Indicator/issues/21 has a discussion.
I translate purcell's workaround into new form of advice and it works for me with emacs24.5.1 and company mode.
my code is like this:

(defun on-off-fci-before-company(command)
  (when (string= "show" command)
    (turn-off-fci-mode))
  (when (string= "hide" command)
    (turn-on-fci-mode)))

(advice-add 'company-call-frontends :before #'on-off-fci-before-company)

purcell commented on 13 Jul 2012

I just wanted to note, particularly for the benefit of @alpaker, that you can work around this problem by temporarily suspending fci-mode while popups are being displayed:

(defvar sanityinc/fci-mode-suppressed nil)
(defadvice popup-create (before suppress-fci-mode activate)
."Suspend fci-mode while popups are visible"
(set (make-local-variable 'sanityinc/fci-mode-suppressed) fci-mode)
(when fci-mode
(turn-off-fci-mode)))
(defadvice popup-delete (after restore-fci-mode activate)
"Restore fci-mode when all popups have closed"
(when (and (not popup-instances) sanityinc/fci-mode-suppressed)
(setq sanityinc/fci-mode-suppressed nil)
(turn-on-fci-mode)))

[alpaker]

Just FYI, I'm abandoning this package and welcoming requests to be take over as maintainer.

[posita]

Just FYI, I'm abandoning this package and welcoming requests to be take over as maintainer.

Thanks @alpaker for the heads up. Please consider indicating status and inviting new maintainers on https://www.emacswiki.org/emacs/FillColumnIndicator as well.

[alpaker]

The functionality provided by this package has now been implemented natively in Emacs as display-fill-column-indicator-mode, available as of version 27.0.90. Unless you are forced to use an older Emacs, you should use the native implementation instead of fci-mode. The former is unaffected by most of the compatibility issues that this add-on has.

[alpaker]

I've updated the emacswiki page as well.