[bug] Windows: `withGlobalTauri: true`: `window.__TAURI__` is undefined while executing top-level scripts: the examples are broken

[WofWca]

Describe the bug

The examples do not work, at least for me on Windows.

Reproduction

1. git clone https://github.com/tauri-apps/tauri.git && cd tauri
2. cargo run --example helloworld
3. Type something and submit the form.

2025-03-15-bXIKVfHYnq.mp4

Expected behavior

The "Hello from Rust" message appears

Full tauri info output

Tauri repo b05f82d35ba068bfeb44193b204fbfe365415a25

Stack trace

Additional context

If I open dev tools and refresh the window, then it starts working.

Looks like with_global_tauri utilizes with_initialization_script

tauri/crates/tauri/src/manager/webview.rs

Lines 377 to 405 in 95fc3cd

	let bundle_script = if with_global_tauri {
	include_str!("../../scripts/bundle.global.js")
	} else {
	""
	};
	let freeze_prototype = if app_manager.config.app.security.freeze_prototype {
	include_str!("../../scripts/freeze_prototype.js")
	} else {
	""
	};
	InitJavascript {
	pattern_script,
	ipc_script,
	bundle_script,
	core_script: &CoreJavascript {
	os_name: std::env::consts::OS,
	protocol_scheme: if use_https_scheme { "https" } else { "http" },
	invoke_key: self.invoke_key(),
	}
	.render_default(&Default::default())?
	.into_string(),
	event_initialization_script: &crate::event::event_initialization_script(
	app_manager.listeners().function_name(),
	app_manager.listeners().listeners_object_name(),
	),
	freeze_prototype,
	}

tauri/crates/tauri-runtime-wry/src/lib.rs

Line 4532 in cedb24d

webview_builder = webview_builder.with_initialization_script(&script);

But its docs state

It is guaranteed that code is executed before window.onload.

I considered just adding a docstring to withGlobalTauri mentioning the fact that you have to wait for onload to finish before using it, but then I saw that we have docs on this https://v2.tauri.app/develop/calling-rust/#basic-example, and the docs don't say anything about onload.

[Legend-Master]

I believe this is the cause: tauri-apps/wry#1418 (comment)