src/vs/editor/common/config/editorOptions.ts/EditorAccessibilitySupport/compute
class EditorAccessibilitySupport:	public override compute(env: IEnvironmentalOptions, options: IComputedEditorOptions, value: AccessibilitySupport): AccessibilitySupport {
		if (value === AccessibilitySupport.Unknown) {
			// The editor reads the `accessibilitySupport` from the environment
			return env.accessibilitySupport;
		}
		return value;
	}