UI freezes when you type in Emacs 25

[agzam]

Description

Emacs-lisp mode in Emacs 25 freezes. I suspect it has something to do with company-mode.
I do not see this in Emacs 24.
I am not sure yet, but I think disabling company-mode "fixes" this. It might be an upstream issue with company.el

Reproduction guide 🪲

• Start Emacs
• Open any emacs-lisp mode file. Start typing

Observed behaviour: 👀 💔
there are messages in mini-buffer about parsing and compiling things and that process is blocking Emacs's main UI

System Info 💻

• OS: darwin
• Emacs: 25.1.1
• Spacemacs: 0.105.22
• Spacemacs branch: develop (rev. 107fe46)
• Graphic display: t
• Distribution: spacemacs
• Editing style: vim
• Completion: helm
• Layers:

((org :variables org-enable-reveal-js-support t)
 (auto-completion :variables auto-completion-tab-key-behavior 'cycle)
 emacs-lisp javascript html markdown shell-scripts clojure lua react
 (ruby :variables ruby-enable-enh-ruby-mode t ruby-version-manager 'rvm)
 ruby-on-rails
 (auto-completion :variables auto-completion-enable-snippets-in-popup t auto-completion-enable-help-tooltip t auto-completion-enable-sort-by-usage t)
 syntax-checking spell-checking helm
 (shell :variables shell-enable-smart-eshell t shell-default-term-shell "/bin/zsh")
 (deft :variables deft-directory "~/Google Drive/deft" deft-auto-save-interval 60)
 fasd ibuffer osx chrome semantic restclient emoji ranger search-engine imenu-list pdf-tools git
 (version-control :variables version-control-diff-tool 'diff-hl version-control-global-margin t)
 (github :variables gist-view-gist t)
 agzam ag-dash synonyms)

[aijony]

Hey agzam it's a lot more helpful for me to see the issue. Now I think that could be an issue with the 'spell-checking' layer, because it says starting new ispell process. Try disabling that, I know it has given me similar issues. If that doesn't solve it then my second guess is that it's a problem with emacs 25 async.

[zilongshanren]

@agzam I think you could disable semantic-mode in emacs-lisp-mode to get rid of this issue.

[sooheon]

For me, this only happens inside strings/comments, as well. As far as I can tell, it's not really to do with company or ispell, but semantic is the main culprit like @zilongshanren says.

[syl20bnr]

To disable the semantic layer support in emacs-lisp layer you should be able to use this declaration:

(semantic :disabled-for emacs-lisp)

[agzam]

Yup it worked... should we close this, or maybe think about implementing a flag of some sort, so people switching to 25 struggle less?

[TheBB]

Would :toggle work for non-owned packages in a layer?

[syl20bnr]

Yes :toggle should be overridable by non owning layers in current develop. It was not the case before my last few commits on the layer system, I made a few changes like the variable to inhibit side effects when SPC h SPC is invoked (which parses all the layers to gather information), it allows to have consistent capability to override any keywords without their side effects to be active with SPC h SPC.

[JAremko]

Still happening to me 😢

[d12frosted]

@JAremko have you tried disabling semantic layer?

[JAremko]

@d12frosted As soon as I saw it(like after using emacs 25 for 5 minutes.) I switched back to 24, assuming that it's just a beginning 😄

But this will be a problem for "the thing"

[syl20bnr]

I have the same issue with Emacs 25 in comments in elisp.

[d12frosted]

The same here. But only when I enable semantic layer.

[ninjarai4]

I found a workaround to this issue without disabling auto-completion or semantic by putting this in my user-config:

(with-eval-after-load 'semantic
    (cl-delete-if (lambda (x) (string-match-p "^semantic-" (symbol-name x))) completion-at-point-functions))

There is some more disscussion here

[ninjarai4]

Correcting the code in my previous comment:

(eval-after-load 'semantic
    (add-hook 'semantic-mode-hook
              (lambda ()
                (dolist (x (default-value 'completion-at-point-functions))
                  (when (string-prefix-p "semantic-" (symbol-name x))
                    (remove-hook 'completion-at-point-functions x))))))

Without the add-hook it won't always work.

[sooheon]

Thank you, but semantic-mode-hook should be quoted I think!

[ninjarai4]

Wow, I have no idea how that was working before. I've edited my comment with the correct code, thanks for the help.

[agzam]

Sorry, late to the party, couple of questions:

• Could this be included in the semantic layer?
• What are the benefits of enabling semantic for emacs-lisp mode? I have disabled it and I don't feel like missing anything
• Why the hell it's messing up to begin with? Semantic is a built-in package (I doubt that it is buggy), does that mean something else needs to be fixed?

[aijony]

I was still having this issue on the develop branch.

This snippet did not work for me:

(eval-after-load 'semantic
    (add-hook 'semantic-mode-hook
              (lambda ()
                (dolist (x (default-value 'completion-at-point-functions))
                  (when (string-prefix-p "semantic-" (symbol-name x))
                    (remove-hook 'completion-at-point-functions x))))))

This one did:

(semantic :disabled-for emacs-lisp)