Closes#21822
The issue is closed already, but it was requested to provide the
`hard_tabs` boolean param.
Follow-up to #52175
Reviewed by @maxdeviant (it already bumped the settings path to v0.8.0,
so this `hard_tabs` change only needs 2 files, 2-3 lines of code
additions).
## Context
Exposes `hard_tabs` from `AllLanguageSettings` to the Extension
API's `LanguageSettings` struct. Currently, only `tab_size` and
`preferred_line_length` are available to extensions, which prevents
language extensions (e.g., Go, C++) from reading the user's hard tabs
preference and forwarding it to their language server or formatter
(e.g., as rustfmt.hard_tabs or clang-format.UseTab).
Related:
https://github.com/zed-industries/zed/issues/21822#issuecomment-4139809956
## How to Review
Small change — follow how `tab_size` is plumbed through:
1. WIT definition (`language-settings` record)
2. `extension_api` Rust struct
3. Host-side bridge conversion
The new field follows the exact same pattern.
## Self-Review Checklist
<!-- Check before requesting review: -->
- [x] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- Compile-time verified via WIT bindings; no runtime behavior change
- [x] Performance impact has been considered and is acceptable
Release Notes:
- N/A