LSP (Zed): Auto-import completions incomplete for symbols with common prefix

[baab7]

Describe the Bug

Summary

Completion filtering doesn't update when typing continues - shows only initially fetched results.

Description

When multiple classes start with the same prefix, Pyrefly's auto-import completions only show the results that were fetched first and don't continue fetching as more characters are typed.

MRE:

1. Setup environment:

uv init --bare
uv add --dev pyrefly  
uvx pyrefly init

install pyrefly extension

2. Create files with code

a.py:

class UsersManager:
    pass

b.py:

class UsersController:
    pass
    
# start typing UsersM here

3. Start typing UsersM in b.py
4. Only UsersController appears
5. The UsersManager from a.py doesn't show up

Screen recording

Zed (what is actually) (appears only after manual trigger as write and delete backspace):

pyrefly.bug.mov

VS Code (what is expected):

VSCode.exptected.mov

LSP log

log.log

Original issue: zed-industries/zed#39945 (semi-fixed)

Related commit: aa33ce3

Sandbox Link

No response

(Only applicable for extension issues) IDE Information

Zed: v0.209.6 (Zed)
OS: macOS 26.0.1
Memory: 16 GiB
Architecture: aarch64

[kinto0]

@lolpack recently made a change to this. do you know which version of zed your changes were in?

[baab7]

@kinto0, it was v0.208.4

[lolpack]

@baab7 thanks for reporting this. I tested in Pylance and I see that the autocomplete import is not available, but it does give the option to import it via quickfix. That seems reasonable. I'll see if I can get to it this week.

[lolpack]

@baab7 I tested this again and I do see the auto import available, but it's not as obvious because we don't show the yellow underline. Right now we only show the red underline, and that's if you have type checking enabled (either a setting in your config or a pyrefly.toml file/[tool.pyrefly] in pyproject.toml).

[baab7]

@lolpack, just to clarify - do you see the auto-import completions while actively typing, or only when manually checking completions (because that's what it looks like from your screenshots)?

Because in my testing (videos attached), it works as expected in VSCode exactly while typing, but doesn't work in Zed.

I confirm it does work, but not while typing

[yangdanny97]

Perhaps a good next step is to get the LSP trace logs for the repro in both zed & VsCode, and compare them to see if there's a request that the zed client is omitting that we need to update the completion results. @kinto0 are you able to provide instructions for how to do this?

[kinto0]

Perhaps a good next step is to get the LSP trace logs for the repro in both zed & VsCode, and compare them to see if there's a request that the zed client is omitting that we need to update the completion results. @kinto0 are you able to provide instructions for how to do this?

I've never used zed so I'm not sure about how it works there. but in vscode, LSP trace is shown in the output panel under the pyrefly dropdown when Pyrefly > trace > server is set to verbose

[baab7]

@kinto0, @yangdanny97,

Perhaps a good next step is to get the LSP trace logs for the repro in both zed & VsCode

I've never used zed so I'm not sure about how it works there

Zed log is already attached in the first message. But not VSCode