[ElementCallComponent] Use compound-web's PortalRoot in EC.

src/Modal.test.tsx

@@ -11,6 +11,7 @@ import { type ReactNode, useState } from "react";
 import userEvent from "@testing-library/user-event";
 
 import { Modal } from "./Modal";
+import { RootElementProvider } from "./RootElementContext";
 
 const originalMatchMedia = window.matchMedia;
 afterEach(() => {
@@ -70,3 +71,39 @@ test("the modal renders as a drawer in mobile viewports", () => {
   );
   expect(queryByRole("dialog")).toMatchSnapshot();
 });
+
+test("the modal can be closed by clicking the backdrop, in another window too", async () => {
+  // The drawer test above leaves a touchscreen matchMedia behind; this is
+  // about the desktop dialog
+  window.matchMedia = (): MediaQueryList =>
+    ({
+      matches: false,
+      addEventListener: (): void => {},
+      removeEventListener: (): void => {},
+    }) as unknown as MediaQueryList;
+  // A dialog moved into another window, as a host does for a Document
+  // Picture-in-Picture window: its nodes are not `Node`s of this window
+  const frame = document.createElement("iframe");
+  document.body.appendChild(frame);
+  const otherBody = frame.contentDocument!.body;
+
+  function ModalFn(): ReactNode {
+    const [isOpen, setOpen] = useState(true);
+    return (
+      <RootElementProvider value={otherBody}>
+        <Modal title="My modal" open={isOpen} onDismiss={() => setOpen(false)}>
+          <p>This is the content.</p>
+        </Modal>
+      </RootElementProvider>
+    );
+  }
+  render(<ModalFn />);
+  const dialog = otherBody.querySelector('[role="dialog"]');
+  expect(dialog).not.toBeNull();
+  const backdrop = dialog!.previousElementSibling as HTMLElement;
+
+  const user = userEvent.setup({ document: frame.contentDocument! });
+  await user.click(backdrop);
+  expect(otherBody.querySelector('[role="dialog"]')).toBeNull();
+  frame.remove();
+});

src/Modal.tsx

@@ -160,6 +160,12 @@ export const Modal: FC<Props> = ({
         <DialogPortal container={rootElement}>
           <DialogOverlay
             className={classNames(overlayStyles.bg, overlayStyles.animate)}
+            // Radix dismisses on a pointer down outside the dialog, but only
+            // for event targets that are a `Node` of the window it was loaded
+            // in. A host can move the dialog into another window (a Document
+            // Picture-in-Picture window), whose nodes fail that check, so the
+            // backdrop closes the dialog itself.
+            onClick={() => onDismiss?.()}
           />
           <DialogContent
             asChild

src/__snapshots__/AppBar.test.tsx.snap

@@ -15,7 +15,7 @@ exports[`AppBar > renders 1`] = `
         tabindex="0"
       >
         <div
-          class="_indicator-icon_147l5_17"
+          class="_indicator-icon_j097f_17"
           style="--cpd-icon-button-size: 100%;"
         >
           <svg
@@ -58,7 +58,7 @@ exports[`AppBar > renders with title and subtitle 1`] = `
         tabindex="0"
       >
         <div
-          class="_indicator-icon_147l5_17"
+          class="_indicator-icon_j097f_17"
           style="--cpd-icon-button-size: 100%;"
         >
           <svg

src/room/__snapshots__/InCallView.test.tsx.snap

@@ -181,7 +181,7 @@ exports[`InCallView > rendering > renders 1`] = `
           tabindex="0"
         >
           <div
-            class="_indicator-icon_147l5_17"
+            class="_indicator-icon_j097f_17"
             style="--cpd-icon-button-size: 100%;"
           >
             <svg

src/room/__snapshots__/LobbyView.test.tsx.snap

@@ -15,7 +15,7 @@ exports[`LobbyView > renders with AppBar android 1`] = `
         tabindex="0"
       >
         <div
-          class="_indicator-icon_147l5_17"
+          class="_indicator-icon_j097f_17"
           style="--cpd-icon-button-size: 100%;"
         >
           <svg
@@ -111,7 +111,7 @@ exports[`LobbyView > renders with AppBar android 1`] = `
           tabindex="0"
         >
           <div
-            class="_indicator-icon_147l5_17"
+            class="_indicator-icon_j097f_17"
             style="--cpd-icon-button-size: 100%;"
           >
             <svg
@@ -247,7 +247,7 @@ exports[`LobbyView > renders with AppBar ios 1`] = `
         tabindex="0"
       >
         <div
-          class="_indicator-icon_147l5_17"
+          class="_indicator-icon_j097f_17"
           style="--cpd-icon-button-size: 100%;"
         >
           <svg
@@ -343,7 +343,7 @@ exports[`LobbyView > renders with AppBar ios 1`] = `
           tabindex="0"
         >
           <div
-            class="_indicator-icon_147l5_17"
+            class="_indicator-icon_j097f_17"
             style="--cpd-icon-button-size: 100%;"
           >
             <svg
@@ -621,7 +621,7 @@ exports[`LobbyView > renders with header and participant count 1`] = `
           tabindex="0"
         >
           <div
-            class="_indicator-icon_147l5_17"
+            class="_indicator-icon_j097f_17"
             style="--cpd-icon-button-size: 100%;"
           >
             <svg