fix(Windows): fix windows always visible initially

ref: tauri-apps/tauri#5583

.changes/windows-always-visible.md

@@ -0,0 +1,5 @@
+---
+"tao": "patch"
+---
+
+On Windows, fix window always visible initially.

src/platform_impl/windows/event_loop.rs

@@ -906,7 +906,7 @@ unsafe extern "system" fn public_window_callback<T: 'static>(
   };
 
   if subclass_removed && recurse_depth == 0 {
-    Box::from_raw(subclass_input_ptr);
+    drop(Box::from_raw(subclass_input_ptr))
   }
 
   result

src/platform_impl/windows/menu.rs

@@ -375,7 +375,7 @@ pub(crate) unsafe extern "system" fn subclass_proc(
   let subclass_input = &*(subclass_input_ptr);
 
   if msg == WM_DESTROY {
-    Box::from_raw(subclass_input_ptr);
+    drop(Box::from_raw(subclass_input_ptr));
   }
 
   match msg {

src/platform_impl/windows/mod.rs

@@ -97,15 +97,13 @@ impl DeviceId {
 #[non_exhaustive]
 #[derive(Debug)]
 pub enum OsError {
-  CreationError(&'static str),
   IoError(std::io::Error),
 }
 impl std::error::Error for OsError {}
 
 impl std::fmt::Display for OsError {
   fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
     match self {
-      OsError::CreationError(e) => f.pad(e),
       OsError::IoError(e) => f.pad(&e.to_string()),
     }
   }

src/platform_impl/windows/window.rs

@@ -1074,9 +1074,12 @@ unsafe fn init<T: 'static>(
     }
   }
 
+  if attributes.content_protection {
+    win.set_content_protection(true);
+  }
+
   win.set_visible(attributes.visible);
   win.set_closable(attributes.closable);
-  win.set_content_protection(attributes.content_protection);
 
   if let Some(position) = attributes.position {
     win.set_outer_position(position);