[bug] External window does not load properly on Windows

[lpturmel]

Describe the bug

Creating a new window from the AppHandle struct with the create_window function results in a blank window on Windows.

Example:

#[tauri::command]
fn spawn_window(app: tauri::AppHandle) {
  let external_url = Url::parse("https://google.com").unwrap();

  app.create_window("command_window".to_string(), tauri::WindowUrl::External(external_url), 
  move |window_builder, webview_attributes| {
      (window_builder, webview_attributes)
  });
}

Results in:

Calling the same function from the setup function like so creates the window successfully:

fn main() {
  tauri::Builder::default()
  .setup(|app| {
    let external_url = Url::parse("https://google.com").unwrap();

    app.create_window("window_from_main".to_string(), tauri::WindowUrl::External(external_url), move |window_builder, webview_attributes| {
        (window_builder, webview_attributes)
    });
    Ok(())
  })
  .invoke_handler(tauri::generate_handler![
    spawn_window
  ])
    .run(tauri::generate_context!())
    .expect("error while running tauri application");
}

The exact same project works as expected on MacOS (version 12.2.1).

No console errors are present on the main window and the Dev Tools of the spawned window cannot be accessed (could be possible if there is another way than right click > inspect or F12).

Reproduction

1. Clone the reproduction repo
2. cd tauri-window-issue
3. yarn install or npm install
4. yarn tauri dev or npm run tauri dev

The secondary window that pops up on load will successfully load the link.

The window spawned with the button: create window does not load the link on Windows.

OR

Create a window from a Tauri command invoked by JS.

Expected behavior

The window should successfully load the link when created from the AppHandle struct (?) on Windows.

Platform and versions

Windows:
Operating System - Windows, version 10.0.22000 X64
Webview2 - 98.0.1108.62
Visual Studio Build Tools:
   - Visual Studio Build Tools 2019

Node.js environment
  Node.js - 17.6.0
  @tauri-apps/cli - 1.0.0-rc.5
  @tauri-apps/api - 1.0.0-rc.1

Global packages
  npm - 8.5.1
  pnpm - Not installed
  yarn - 1.22.17

Rust environment
  rustup - 1.24.3
  rustc - 1.58.1
  cargo - 1.58.0
  toolchain - stable-x86_64-pc-windows-msvc

App directory structure
/.git
/node_modules
/src
/src-tauri

App
  tauri - 1.0.0-rc.3
  tauri-build - 1.0.0-rc.3
  tao - 0.6.3
  wry - 0.13.3
  build-type - bundle
  CSP - unset
  distDir - ../public
  devPath - http://localhost:3000/


MacOS:

Operating System - Mac OS, version 12.2.1 X64

Node.js environment
  Node.js - 16.3.0
  @tauri-apps/cli - 1.0.0-rc.5
  @tauri-apps/api - 1.0.0-rc.1

Global packages
  npm - 7.17.0
  pnpm - 6.14.5
  yarn - 1.22.11

Rust environment
  rustup - 1.24.3
  rustc - 1.58.1
  cargo - 1.58.0
  toolchain - stable-aarch64-apple-darwin 

App directory structure
/node_modules
/src-tauri
/.git
/src

App
  tauri - 1.0.0-rc.3
  tauri-build - 1.0.0-rc.3
  tao - 0.6.3
  wry - 0.13.3
  build-type - bundle
  CSP - unset
  distDir - ../public
  devPath - http://localhost:3000/

Stack trace

No response

Additional context

The behaviour has already been replicated on different environments (this was initially reported by a colleague).

[lucasfernog]

Seems like it's a deadlock, changing the command to be async fixes it. I'll keep investigating.

[lucasfernog]

I've opened an issue on wry to track this issue: tauri-apps/wry#583
I'll try a different window creation approach in the meantime.

[lucasfernog]

PR fixing this: #3684

[lucasfernog]

FYI we'll revert the fix so commands will need to be async in other to create a webview on Windows.