[Spacemacs `develop`] Any `lsp` mode: no working `lsp` until saving file and reverting / reloading

[stradicat]

Thank you for the bug report

• [X] I am using the latest version of lsp-mode related packages.
• [X] I checked FAQ and Troubleshooting sections
• [X] You may also try reproduce the issue using clean environment using the following command

  emacs -q -l lsp-start-plain.el

  where lsp-start-plain.el can be downloaded here.

Bug description

Description :octocat:

No syntax highlighting on any language supported by lsp-mode until saving file and reverting/reloading

Observed behaviour: :eyes: :broken_heart: No working lsp until saving file and reverting / reloading

Steps to reproduce

Reproduction guide :beetle:

• Start Emacs
• Create a new buffer with C-x b newfile.extension; let's exemplify this case with Python: C-x b new.py
• Buffer is recognized as Python, but lsp won't work until saving the file. Save the file: C-x C-w new.py
• No lsp-supported language server on sight. M-x revert-buffer to reload new.py
• LSP properly handles new.py and loads the appropriate language server
• The above happens for every language I've tried (Java, Python, Kotlin, Dart, Rust, Go, C / C++)

Expected behavior

Expected behaviour: :heart: :smile: Working lsp at the moment of buffer creation, or at least right after saving the file

Which Language Server did you use?

lsp-python, lsp-rust, lsp-java, lsp-dart, lsp-html, lsp-go

OS

Linux

Error callstack

No response

Anything else?

System Info :computer:

• OS: gnu/linux
• Emacs: 27.2
• Spacemacs: 0.300.0
• Spacemacs branch: develop (rev. 548edefcc)
• Graphic display: t
• Distribution: spacemacs
• Editing style: hybrid
• Completion: helm
• Layers:

  ((c-c++ :variables c-c++-adopt-subprojects t c-c++-backend 'lsp-ccls c-c++-dap-adapters 'dap-lldb)
  (clojure :variables clojure-backend 'lsp clojure-enable-fancify-symbols t clojure-enable-linters
        '(clj-kondo joker))
  csv
  (dart :variables dart-backend 'lsp lsp-dart-flutter-sdk-dir "~/flutter/bin/" lsp-dart-sdk-dir "~/flutter/bin/cache/dart-sdk/")
  emacs-lisp
  (go :variables go-backend 'lsp go-use-golangci-lint t godoc-at-point-function 'godoc-gogetdoc gofmt-command "gofumpt")
  graphql groovy
  (html :variables web-fmt-tool 'web-beautify)
  (java :variables javascript-backend 'lsp)
  (javascript :variables javascript-backend 'lsp javascript-fmt-tool 'web-beautify javascript-import-tool 'import-js javascript-repl 'nodejs js2-include-node-externs t)
  (json :variables json-fmt-tool 'web-beautify)
  (julia :variables julia-backend 'lsp)
  (kotlin :variables kotlin-backend 'lsp kotlin-lsp-jar-path "/home/dmayr/kotlin-language-server/server/bin/kotlin-language-server")
  major-modes octave
  (perl5 :variables perl5-backend 'lsp)
  (plantuml :variables plantuml-jar-path "/usr/share/plantuml/plantuml.jar" org-plantuml-jar-path "/usr/share/plantuml/plantuml.jar")
  (php :variables php-backend 'ac-php-core)
  (python :variables python-backend 'lsp python-lsp-server 'pyright python-test-runner
       '(pytest nose)
       python-formatter 'yapf python-sort-imports-on-save t)
  (rust :variables rust-backend 'lsp lsp-rust-server 'rust-analyzer cargo-process-reload-on-modify t)
  (sql :variables sql-backend 'lsp sql-capitalize-keywords t sql-lsp-sqls-workspace-config-path 'workspace)
  (typescript :variables typescript-backend 'lsp typescript-fmt-tool 'typescript-formatter)
  react
  (vue :variables vue-backend 'lsp)
  ansible asciidoc markdown nginx
  (shell-scripts :variables shell-scripts-backend 'lsp)
  systemd windows-scripts yaml
  (auto-completion :variables auto-completion-enable-sort-by-usage t)
  better-defaults emoji
  (geolocation :variables geolocation-enable-automatic-theme-changer t)
  helm helpful
  (lsp :variables lsp-lens-enable t lsp-headerline-breadcrumb-enable t)
  (multiple-cursors :variables multiple-cursors-backend 'evil-mc)
  nav-flash
  (org :variables org-enable-appear-support t org-enable-asciidoc-support t org-enable-bootstrap-support t org-enable-epub-support t org-enable-hugo-support t org-enable-github-support t org-enable-notifications t org-start-notification-daemon-on-startup t org-enable-org-journal-support t org-journal-dir "~/Documentos/emacs-journal/" org-enable-trello-support t org-enable-valign t org-todo-dependencies-strategy 'naive-auto)
  (shell :variables shell-default-height 30 shell-default-position 'bottom)
  (spell-checking :variables spell-checking-enable-auto-dictionary t)
  (treemacs :variables treemacs-use-collapsed-directories 3 treemacs-use-git-mode 'deferred treemacs-use-filewatch-mode t treemacs-use-all-the-icons-theme t)
  (unicode-fonts :variables unicode-fonts-enable-ligatures t unicode-fonts-ligature-set
              '("<*" "<*>" "<+>" "<$>" "***" "<|" "|>" "<|>" "!!" "||" "===" "==>" "<<<" ">>>" "<>" "+++" "<-" "->" "=>" ">>" "<<" ">>=" "=<<" "-<" ">-" "-<<" ">>-" "/=" "==" "::" "++"))
  (bibtex :variables bibtex-enable-ebib-support t)
  (cmake :variables cmake-backend 'lsp cmake-enable-cmake-ide-support t)
  copy-as-format epub eww dap debug docker elasticsearch
  (git :variables git-enable-magit-gitflow-plugin t)
  github gtags import-js meson pandoc pdf prettier quickurl search-engine slack syntax-checking systemd templates version-control web-beautify
  (xclipboard :variables xclipboard-enable-cliphist t)
  spotify)

• System configuration features: XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON PDUMPER LCMS2 GMP

[yyoncho]

This is expected behaviour C-x b won't set the file name of the buffer, thus lsp-mode cannot start. Use C-x C-f to create new files.