Add hack for Chromium bug

packages/components/src/modal/aria-helper.ts

@@ -67,4 +67,14 @@ export function unmodalize() {
 	for ( const element of hiddenElements ) {
 		element.removeAttribute( 'inert' );
 	}
+
+	// Hacks around a Chromium bug where it may fail to restore a region to the
+	// accessibility tree after an ancestor had the `inert` attribute removed.
+	// The bug seems like a variation of this: https://crbug.com/1354313
+	// This workaround doesn't have to be a custom property. It also seems to
+	// not have to be done each invocation but it's inexpensive and ensures
+	// some other code didn't remove it.
+	document
+		.querySelectorAll< HTMLElement >( '[role=region]' )
+		.forEach( ( region ) => region.style.setProperty( '--∞', '8' ) );
 }