fix hydration

packages/web/src/launch.rs

@@ -12,11 +12,18 @@ pub fn launch(
     contexts: Vec<Box<dyn Fn() -> Box<dyn Any>>>,
     platform_config: Config,
 ) {
+    let mut vdom = VirtualDom::new(root);
+    for context in contexts {
+        vdom.insert_any_root_context(context());
+    }
+    launch_virtual_dom(vdom, platform_config);
+}
+
+/// Launch the web application with a prebuild virtual dom
+///
+/// For a builder API, see `LaunchBuilder` defined in the `dioxus` crate.
+pub fn launch_virtual_dom(vdom: VirtualDom, platform_config: Config) {
     wasm_bindgen_futures::spawn_local(async move {
-        let mut vdom = VirtualDom::new(root);
-        for context in contexts {
-            vdom.insert_any_root_context(context());
-        }
         crate::run(vdom, platform_config).await;
     });
 }