Avoid blocking WebView2 creation with message pump

.github/workflows/build.yml

@@ -70,7 +70,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: install nightly
-        uses: dtolnay/rust-toolchain@nightly
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: nightly-2025-07-01
       - name: install webkit2gtk
         run: |
           sudo apt-get update -y -q

src/lib.rs

@@ -2000,7 +2000,7 @@ pub enum MemoryUsageLevel {
 #[cfg(target_os = "windows")]
 pub trait WebViewExtWindows {
   /// Returns WebView2 Controller
-  fn controller(&self) -> ICoreWebView2Controller;
+  fn controller(&self) -> Option<ICoreWebView2Controller>;
 
   /// Changes the webview2 theme.
   ///
@@ -2028,8 +2028,8 @@ pub trait WebViewExtWindows {
 
 #[cfg(target_os = "windows")]
 impl WebViewExtWindows for WebView {
-  fn controller(&self) -> ICoreWebView2Controller {
-    self.webview.controller.clone()
+  fn controller(&self) -> Option<ICoreWebView2Controller> {
+    self.webview.controller()
   }
 
   fn set_theme(&self, theme: Theme) -> Result<()> {