Completions disappear after dot + symbol

[Hi-Angel]

Thank you for the bug report

• I am using the latest version of lsp-mode related packages.
• I checked FAQ and Troubleshooting sections
• You may also try reproduce the issue using clean environment using the following command: M-x lsp-start-plain

Bug description

lsp-mode treats . specially for many languages, as in, it provides completions immediately even though company-minimum-prefix-length isn't satisfied. Which makes sense of course. Unfortunately, lsp-mode loses completion after typing out the next symbol, instead of reducing them to ones that start with the symbol.

So e.g. foo. pops up completions, but foo.c kills the pop up even if there are candidates.

Also asked as a question here: https://emacs.stackexchange.com/questions/80977/prevent-lsp-company-from-losing-completion-after-dot-symbol

Side note: elgot, the competitor mode, handles that correctly.

Steps to reproduce

1. Create /tmp/.emacs as follows:

   (package-initialize)
   (use-package company)
   (use-package lsp)

2. Start emacs as emacs -Q -l /tmp/.emacs test.py

3. Execute M-x lsp

4. Type "".

   A completion should appear

5. Type c to reduce completions to ones starting with that letter

Expected behavior

Completions get reduced to ones starting with c, i.e. capitalize(), casefold(), etc.

Which Language Server did you use?

lsp-python, lsp-go, clangd.

OS

Linux

Error callstack

No response

Anything else?

No response

[jcs090218]

I'm using my own company-fuzzy, so I don't have this issue. Let me ping one of the maintainers.

cc @kiennq