Add --disableLanguageFeature CLI switch and MSBuild property to selectively disable language features#19167

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T-Gro merged 37 commits intomainfrom

copilot/add-disable-language-feature-cli

Jan 20, 2026

Commits on Dec 17, 2025

Fix null handling and use Set for disabledLanguageFeatures

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Update help baseline with --disableLanguageFeature option

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Add DisabledLanguageFeatures MSBuild property support

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Commits on Dec 18, 2025

Commits on Dec 19, 2025

Fix nullness warning in TryParseFeature by using box before downcast

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Commits on Jan 5, 2026

Commits on Jan 6, 2026

Investigation findings: Tests reveal --disableLanguageFeature not working

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Commits on Jan 8, 2026

Fix config clone
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Commits on Jan 9, 2026

Merge branch 'main' into copilot/add-disable-language-feature-cli
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Commits on Jan 12, 2026

Commits on Jan 15, 2026

Merge branch 'main' into copilot/add-disable-language-feature-cli
T-Gro
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Commits on Jan 19, 2026