Webview example crashes on startup (RefCell already borrowed)

[mengh04]

Description

The application panics with RefCell already borrowed immediately after launching the webview example. This appears to be a reentrancy issue where gpui::app::AppCell::borrow_mut is called while the cell is already borrowed during the window drawing/initialization process on Windows.

Environment

• GPUI (Zed): a70e2ad075855582d08d98f (extracted from local cargo path)
• GPUI Component: v0.5.1 (as per workspace version)
• Platform: Windows 11 (MSVC)

Steps to Reproduce

1. Clone the repository.
2. Navigate to gpui-component\examples\webview.
3. Run cargo run.
4. The window opens briefly and immediately crashes.

Screenshots

Expected

The webview window should initialize and render correctly without panicking.

Actual

The program panics with the following error:

thread 'main' panicked at ...\gpui\src\app\async_context.rs:146:28:
RefCell already borrowed
stack backtrace:
...
5: gpui::app::AppCell::borrow_mut
6: gpui::app::async_context::AsyncApp::update::...
7: gpui::window::impl$26::new::closure$3
9: gpui_windows::window::WindowsWindowInner::draw_window
...
20: webview2_com::wait_with_pump