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Windows: Focus is broken when an invisible window is created with maximized

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
65/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Quiet
Tech stack
rust
Domain
desktop, operating-systems

Research direction

Start with winit/examples/window.rs and reproduce the report using cargo run --example window with an invisible maximized window. Trace the Windows focus handling around create_window, set_visible(true), and WindowEvent::Focused; done means clicking the opened window emits Window focus changed: true and updates the internal focus state.

Written by the indexing model from the issue text.

Description

B - bug DS - win32
Description
Repro
  1. Apply the following patch
  2. Run cargo run --example window
  3. Before a window is opened, move focus to another window
  4. winit window is opened without focus
  5. Click somewhere on the winit window to move focus to the window
  6. Window focus changed: true is expected to be printed but actually it is not printed. The winit window is actually focused but its internal state is still focused == false.
diff --git a/winit/examples/window.rs b/winit/examples/window.rs
index 7d9fc59f..1e22f893 100644
--- a/winit/examples/window.rs
+++ b/winit/examples/window.rs
@@ -23,12 +23,16 @@ struct App {
 impl ApplicationHandler for App {
     fn can_create_surfaces(&mut self, event_loop: &dyn ActiveEventLoop) {
         #[cfg(not(web_platform))]
-        let window_attributes = WindowAttributes::default();
+        let window_attributes =
+            WindowAttributes::default().with_maximized(true).with_visible(false);
         #[cfg(web_platform)]
         let window_attributes = WindowAttributes::default()
             .with_platform_attributes(Box::new(WindowAttributesWeb::default().with_append(true)));
         self.window = match event_loop.create_window(window_attributes) {
-            Ok(window) => Some(window),
+            Ok(window) => {
+                window.set_visible(true);
+                Some(window)
+            },
             Err(err) => {
                 error!("error creating window: {err}");
                 event_loop.exit();
@@ -38,8 +42,11 @@ impl ApplicationHandler for App {
     }

     fn window_event(&mut self, event_loop: &dyn ActiveEventLoop, _: WindowId, event: WindowEvent) {
-        info!("{event:?}");
+        // info!("{event:?}");
         match event {
+            WindowEvent::Focused(focused) => {
+                println!("Window focus changed: {focused}");
+            },
             WindowEvent::CloseRequested => {
                 info!("Close was requested; stopping");
                 event_loop.exit();
Windows version
Microsoft Windows [Version 10.0.26200.8457]
Winit version

HEAD (c4afadbfabf7b1e7989b40b493db1a4c7bd8ff4e)

Dominant language
Rust
Stars
6.2k
Forks
1.4k
Avg merge
2d 16h
Merged PRs (30d)
10

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