enhance(windows): disable our in-client resizing for undecorated window with shadows (#12817)

* enhance(windows): disable our in-client resizing for undecorated window with shadows

ref: tauri-apps/tao#1052

* skip hittesting for undeceorated windows

Author: amrbashir

.changes/undecorated-resizing-windows-outside.md

@@ -0,0 +1,5 @@
+---
+"tauri": "patch:enhance"
+---
+
+On Windows, undecorated window with shadows, now have native resize handles outside of the window client area.

Cargo.lock

@@ -23,7 +23,7 @@ wry = { version = "0.50.0", default-features = false, features = [
   "os-webview",
   "linux-body",
 ] }
-tao = { version = "0.32.1", default-features = false, features = ["rwh_06"] }
+tao = { version = "0.32.2", default-features = false, features = ["rwh_06"] }
 tauri-runtime = { version = "2.3.0", path = "../tauri-runtime" }
 tauri-utils = { version = "2.1.1", path = "../tauri-utils" }
 raw-window-handle = "0.6"

crates/tauri-runtime-wry/Cargo.toml

@@ -3013,7 +3013,10 @@ fn handle_user_message<T: UserEvent>(
             if !resizable {
               undecorated_resizing::detach_resize_handler(window.hwnd());
             } else if !window.is_decorated() {
-              undecorated_resizing::attach_resize_handler(window.hwnd());
+              undecorated_resizing::attach_resize_handler(
+                window.hwnd(),
+                window.has_undecorated_shadow(),
+              );
             }
           }
           WindowMessage::SetMaximizable(maximizable) => window.set_maximizable(maximizable),
@@ -3039,12 +3042,18 @@ fn handle_user_message<T: UserEvent>(
             if decorations {
               undecorated_resizing::detach_resize_handler(window.hwnd());
             } else if window.is_resizable() {
-              undecorated_resizing::attach_resize_handler(window.hwnd());
+              undecorated_resizing::attach_resize_handler(
+                window.hwnd(),
+                window.has_undecorated_shadow(),
+              );
             }
           }
           WindowMessage::SetShadow(_enable) => {
             #[cfg(windows)]
-            window.set_undecorated_shadow(_enable);
+            {
+              window.set_undecorated_shadow(_enable);
+              undecorated_resizing::update_drag_hwnd_rgn_for_undecorated(window.hwnd(), _enable);
+            }
             #[cfg(target_os = "macos")]
             window.set_has_shadow(_enable);
           }
@@ -4490,7 +4499,7 @@ fn create_webview<T: UserEvent>(
     undecorated_resizing::attach_resize_handler(&webview);
     #[cfg(windows)]
     if window.is_resizable() && !window.is_decorated() {
-      undecorated_resizing::attach_resize_handler(window.hwnd());
+      undecorated_resizing::attach_resize_handler(window.hwnd(), window.has_undecorated_shadow());
     }
   }