fix(core): fix child webviews on macOS and Windows treated as full webview window (#11616)

* fix(core): fix child webviews on macOS and Windows treated as full webview window

closes #11452

* Update .changes/child-windows-macos.md

Author: amrbashir

.changes/child-windows-macos.md

@@ -0,0 +1,7 @@
+---
+"tauri": "patch:bug"
+"tauri-runtime-wry": "patch:bug"
+---
+
+Fix regression in creating child webviews on macOS and Windows, covering the whole window.
+

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

@@ -4364,7 +4364,7 @@ fn create_webview<T: UserEvent>(
       target_os = "ios",
       target_os = "android"
     ))]
-    WebviewKind::WindowChild => webview_builder.build(&window),
+    WebviewKind::WindowChild => webview_builder.build_as_child(&window),
     WebviewKind::WindowContent => {
       #[cfg(any(
         target_os = "windows",