Test component fixture token palette restoration

[Henning Dieterichs (hediet)]

Follow-up to #335568.\n\nThis installs a distinct valid sentinel token color map before acquiring the shared fixture tokenizers, verifies that disposing the final fixture restores that sentinel, and restores the test process's original palette in a finally block. This exercises the production restoration branch without installing an invalid color map that can crash existing color-map consumers.\n\nValidation:\n- npm run transpile-client\n- npm exec eslint -- src/vs/workbench/test/browser/componentFixtures/fixtureSyntaxHighlighting.test.ts\n- scripts\test.bat --run src\vs\workbench\test\browser\componentFixtures\fixtureSyntaxHighlighting.test.ts

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused test change correctly exercises restoration while reliably preserving global test state.

Review tier: Balanced
Findings: None

What changed in this PR

Adds regression coverage for restoring the shared token palette after fixture tokenizer disposal.

Changes:

• Installs a valid sentinel color map before tokenizer acquisition.
• Verifies final disposal restores the sentinel.
• Restores the original test palette in finally.

File	Description
src/​vs/​workbench/​test/​browser/​componentFixtures/​fixtureSyntaxHighlighting.test.ts	Strengthens palette restoration and test isolation coverage.

---

💡 Add a code-review agent skill or configure MCP servers for context-aware, tailored reviews. Learn more in the docs.

[github-actions]

Screenshot Changes

Base: 17d6a400 Current: dd3ce8f5

Changed (1)

imageCarousel/imageCarousel/MultipleSections/Dark

Before	After

1 insignificant change(s) omitted (≤20 px, Δ≤2). See CI logs for details.

[Allen Bacabis Santiago (saitanallensantiago26-beep)]

Follow-up to #335568.\n\nThis installs a distinct valid sentinel token color map before acquiring the shared fixture tokenizers, verifies that disposing the final fixture restores that sentinel, and restores the test process's original palette in a finally block. This exercises the production restoration branch without installing an invalid color map that can crash existing color-map consumers.\n\nValidation:\n- npm run transpile-client\n- npm exec eslint -- src/vs/workbench/test/browser/componentFixtures/fixtureSyntaxHighlighting.test.ts\n- scripts\test.bat --run src\vs\workbench\test\browser\componentFixtures\fixtureSyntaxHighlighting.test.ts

• [ ]