WIP: Add primer_react_css_contain_portal feature flag #7363
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When enabled, applies `contain: layout style` to Portal elements to improve rendering performance by isolating layout and style calculations. The containment does not clip overflow, so dropdowns/tooltips continue to work correctly. - Added useFeatureFlag check in Portal component - Added useLayoutEffect to apply/remove containment based on flag - Added comprehensive tests for the feature flag behavior
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When enabled, applies
contain: layout styleto Portal elements to improve rendering performance by isolating layout and style calculations. The containment does not clip overflow, so dropdowns/tooltips continue to work correctly.Closes #
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