# Objective

Fix a Windows CI flake in `extension_host
extension_store_test::test_extension_store_with_test_extension`, which
panicked in GPUI's leak detector with three leaked `LspStore` handles
([example
run](https://github.com/zed-industries/zed/actions/runs/28871529605/job/85635418351)).

## Solution

`LspAccess::ViaLspStore` held a strong `Entity<LspStore>`, cloned into
three `ExtensionHostProxy` registrations by `language_extension::init`.
The proxy sits inside an `Arc` cycle (proxy →
`LanguageServerRegistryProxy` → `LanguageRegistry` →
`ExtensionLspAdapter` → `WasmExtension` → `WasmHost` → proxy), so
whenever an extension LSP adapter was registered at app-drop time, the
cycle pinned the `LspStore` entity after its owning `Project` dropped.
The flake was purely timing: extension reload toggles the adapter
registration, and an unclean LSP pipe shutdown on Windows shifted
teardown into the pinned window.

`ViaLspStore` now holds a `WeakEntity<LspStore>`, upgraded at its sole
use site (`remove_language_server`), skipping the stop task when the
store is gone — matching the existing `ViaWorkspaces` semantics. A dead
store is the expected terminal state after the owning project drops, so
no error is logged or propagated. `Project`/`HeadlessProject` remain the
sole long-term owners of `LspStore`, which is already the convention
everywhere else (e.g. `json_schema_store`, the `lsp_store` message
handlers).

## Testing

- Ran `cargo nextest run -p extension_host
extension_store_test::test_extension_store_with_test_extension` locally:
passes.
- The flake is timing-dependent (reproduced on Windows CI), so a local
pass doesn't prove absence; the fix removes the only strong non-owner
handle, which the leak detector reported.

## Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content adheres to Zed's UI standards
([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
and
[icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md)
guidelines)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

---

Release Notes:

- N/A

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Co-authored-by: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>