company with lsp-dart does not completion after "." has been typed.

[chap9]

Describe the bug
lsp-dart is installed, but when "obj." is typed, completion is not triggered as expected. Execute company-capf manually will show the completion.

To Reproduce

This is the minimal config that can reproduce the problem. Will use straight and use-package, but they probably irrelevant with this issue. The cc-mode used here is trying to show that completion works fine with c++.

(if (eq system-type 'darwin)
  (setq
    mac-command-modifier 'control
    mac-option-modifier 'meta))

(defvar bootstrap-version)
(let
  (
    (bootstrap-file
      (expand-file-name "straight/repos/straight.el/bootstrap.el"
        user-emacs-directory))
    (bootstrap-version 6))
  (unless (file-exists-p bootstrap-file)
    (with-current-buffer
      (url-retrieve-synchronously
        "https://raw.githubusercontent.com/radian-software/straight.el/develop/install.el"
        'silent
        'inhibit-cookies)
      (goto-char (point-max))
      (eval-print-last-sexp)))
  (load bootstrap-file nil 'nomessage))

(straight-use-package 'use-package)

(use-package
  lsp-mode
  :ensure t
  :defer t
  :straight t
  :config
  (setq lsp-signature-function 'lsp-signature-posframe)
  (setq lsp-modeline-diagnostics-scope :file)
  (setq lsp-lens-enable t)
  :ensure t)


(use-package
  lsp-ui
  :ensure t
  :defer t
  :straight t
  :hook (lsp-mode . lsp-ui-mode)
  :config
  (setq lsp-ui-doc-use-webkit t)
  (setq lsp-ui-doc-max-width 60)
  (setq lsp-ui-doc-show-with-mouse nil)
  (setq lsp-ui-doc-show-with-cursor t)
  (setq lsp-ui-doc-position 'at-point)
  (setq lsp-ui-doc-delay 1.5))

(use-package
  lsp-dart
  :ensure t
  :straight t
  :hook
  (dart-mode . lsp-deferred))


(use-package
  company-posframe
  :requires posframe
  :ensure t
  :straight t
  :diminish company-posframe-mode)


(use-package
  company
  :straight t
  :ensure t
  :defer t
  :config
  (company-posframe-mode 1)
  (setq company-idle-delay 0)
  (setq company-show-quick-access t)
  (setq company-selection-wrap-around t))


(use-package
  cc-mode
  :ensure t
  :defer t
  :straight t
  :hook
  (c++-mode . lsp-deferred))

Expected behavior
Completion shows after typed ".".

Screenshots

class SomeType {
  SomeType();

  void func1() {
    print("Hello world");
  }
}

void main() {
  var x = SomeType();
  x. // --> SHOW THE candidates, like func1, hashCode etc.
}

Version
[LSP Dart] 1.24.2 at 2023.10.25 @ Emacs 28.2
[Dart SDK] Dart SDK version: 3.1.4 (stable) (Tue Oct 17 14:55:53 2023 +0000) on "macos_arm64"

[Flutter SDK] /opt/homebrew/Caskroom/flutter/3.13.8/flutter/
[Flutter project] false
[Project entrypoint] Not found

[rustbuckett]

I believe that I'm having the same problem, though my config is different. My config is mostly just from the lsp-mode page and the lsp-dart page. I'm not exactly Emacs literate yet, so my troubleshooting has been minimal.

When I do something like:

void main() {
  var s1 = "this is a string";
  print(s1.); // <-- Show possible completions
}

All I get is a sideline message that says "Expected an identifier. [missing_identifier]".

Here is my relevant config:

  (use-package lsp-mode
    :init
    ;; set prefix for lsp-command-keymap (few alternatives - "C-l", "C-c l")
    (setq lsp-keymap-prefix "C-c l")
    :hook (;; replace XXX-mode with concrete major-mode(e. g. python-mode)
  	   (python-mode . lsp-deferred)
  	   ;; (dart-mode . lsp-deferred)
  	   (dockerfile-mode . lsp-deferred)
  	   (html-mode . lsp-deferred)
  	   (typescript-mode . lsp-deferred)
  	   (lua-mode . lsp-deferred)
  	   (yaml-mode . lsp-deferred)
  	   ;; if you want which-key integration
  	   (lsp-mode . lsp-enable-which-key-integration))
    :commands lsp)

  ;; optionally
  (use-package lsp-ui :commands lsp-ui-mode)
  ;; if you are helm user
  ;; (use-package helm-lsp :commands helm-lsp-workspace-symbol)
  ;; if you are ivy user
  (use-package lsp-ivy :commands lsp-ivy-workspace-symbol)
  (use-package lsp-treemacs :commands lsp-treemacs-errors-list)

  ;; optionally if you want to use debugger
  ;; (use-package dap-mode)
  ;; (use-package dap-LANGUAGE) to load the dap adapter for your language

  ;; optional if you want which-key integration
  (use-package which-key
      :config
      (which-key-mode))

  ;; this might be necessary for lsp-dart
  (use-package
    lsp-dart
    :ensure t
    :straight t
    :hook
    (dart-mode . lsp-deferred))

UPDATE: I also just noticed that if I do something like the Dart code above, even if I explicitly define a String, I get a message in the minibuffer when I type '.' that says "Type: InvalidType".

When I open a .dart file, I get the message:

LSP :: Connected to [dart_analysis_server:153125/starting /home/user/projectDir].
LSP :: dart_analysis_server:153125 initialized successfully in folders: (/home/user/projectDir)