[bug] [beta.2] [windows] Flakey error when creating new windows with tauri commands

[huangmingg]

Describe the bug

This is probably related to #8196, but a slightly different variant.

Unlike that issue however, I don't face any issue when creating windows on setup, or from tauri.conf.json. Instead, I get this error:
failed to create webview: WebView2 error: WindowsError(Error { code: HRESULT(0x8007139F), message: "The group or resource is not in the correct state to perform the requested operation." })

when invoking a tauri command that creates a new webview window, after the main window is loaded. To provide more context, this is a flakey behavior, and would actually work sometimes (if it fails for the first call, will have to re-run the dev command, or re-open the built app. if it works for the first call, the subsequent calls always seem to be successful as well).

I have followed the suggestions on the related issue, and am on the latest webview2 version (121.0.2277.128). I have also tried to create all windows manually, including the main window (so nothing defined in tauri.conf.json, but that does not work as well.

Reproduction

Adding the following command to commands example of tauri

#[command]
async fn open_new_window(
handle: tauri::AppHandle,
) {
let _docs_window = tauri::WebviewWindowBuilder::new(
&handle,
"newWindow",
tauri::WebviewUrl::App("index.html".into()),
)
.center()
.title("New Window")
.resizable(false)
.build()
.unwrap();
}

Expected behavior

It works sometimes, and fails with the following error on others
failed to create webview: WebView2 error: WindowsError(Error { code: HRESULT(0x8007139F), message: "The group or resource is not in the correct state to perform the requested operation." })

Full tauri info output

[✔] Environment
    - OS: Windows 10.0.19045 X64
    ✔ WebView2: 121.0.2277.128
    ✔ MSVC: Visual Studio Build Tools 2022
    ✔ rustc: 1.74.1 (a28077b28 2023-12-04)
    ✔ cargo: 1.74.1 (ecb9851af 2023-10-18)
    ✔ rustup: 1.26.0 (5af9b9484 2023-04-05)
    ✔ Rust toolchain: stable-x86_64-pc-windows-msvc (default)
    - node: 16.16.0
    - pnpm: 6.11.0
    - yarn: 1.22.15
    - npm: 8.11.0


[-] Packages
    - tauri [RUST]: 2.0.0-beta.2
    - tauri-build [RUST]: 2.0.0-beta.1
    - wry [RUST]: 0.36.0
    - tao [RUST]: 0.25.0
    - @tauri-apps/api [NPM]: 2.0.0-beta.0
    - @tauri-apps/cli [NPM]: 2.0.0-beta.1

[-] App
    - build-type: bundle
    - CSP: unset
    - frontendDist: ../dist
    - devUrl: http://localhost:1420/
    - framework: Vue.js 
    - bundler: Vite

Stack trace

No response

Additional context

No response

[amrbashir]

fixed by tauri-apps/wry#1182