Xin Zhao 05b69cef68 editor: Support disabling semantic token highlighting via empty rules (#52963)
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 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
- [x] Performance impact has been considered and is acceptable

Closes #52882, should help #52723

According to the [Zed
documentation](https://zed.dev/docs/semantic-tokens#example-disabling-a-token-type),
users should be able to disable semantic highlighting for a specific
token type by adding an empty rule in `settings.json`.

However, the current implementation fails to respect this because its
merging logic allows lower-priority default styles to "leak through"
even when a matching high-priority rule is empty. This makes it
impossible to selectively disable semantic tokens to reveal the
underlying Tree-sitter highlighting when using "semantic_tokens":
"combined". This is particularly problematic for extensions that provide
specialized Tree-sitter queries which are currently being obscured by
less desirable semantic tokens(#52723).

This PR fixes the logic to ensure that a completely empty high-priority
rule acts as an opaque override, correctly disabling semantic styling
for that token type and allowing Tree-sitter highlighting to show
through as intended.

Release Notes:

- Fixed a bug where semantic token highlighting could not be disabled
via empty rules in `settings.json`.
2026-04-02 06:43:16 +00:00
2026-01-22 23:57:26 +05:30
WIP
2023-12-14 09:25:14 -07:00
2024-09-30 17:46:21 -04:00
2026-02-03 20:31:02 -07:00
2025-02-04 09:02:59 -05:00
2025-02-04 09:02:59 -05:00
2026-01-06 12:49:51 -08:00
2025-10-27 13:27:59 -04:00
2025-10-17 18:58:14 +00:00
2026-03-17 16:34:35 +00:00

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