On Windows, fix icons specified on WindowBuilder not taking effect for windows created after the first one (#2530)

CHANGELOG.md

@@ -8,6 +8,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 
 # Unreleased
 
+- On Windows, fix icons specified on `WindowBuilder` not taking effect for windows created after the first one.
 - On Windows and macOS, add `Window::title` to query the current window title.
 - On Windows, fix focusing menubar when pressing `Alt`.
 - On MacOS, made `accepts_first_mouse` configurable.

src/platform_impl/windows/window.rs

@@ -794,7 +794,6 @@ impl<'a, T: 'static> InitData<'a, T> {
         let window_state = {
             let window_state = WindowState::new(
                 &self.attributes,
-                self.pl_attribs.taskbar_icon.clone(),
                 scale_factor,
                 current_theme,
                 self.attributes.preferred_theme,
@@ -904,6 +903,8 @@ impl<'a, T: 'static> InitData<'a, T> {
         }
 
         win.set_skip_taskbar(self.pl_attribs.skip_taskbar);
+        win.set_window_icon(self.attributes.window_icon.clone());
+        win.set_taskbar_icon(self.pl_attribs.taskbar_icon.clone());
 
         let attributes = self.attributes.clone();
 
@@ -957,7 +958,7 @@ where
 {
     let title = util::encode_wide(&attributes.title);
 
-    let class_name = register_window_class::<T>(&attributes.window_icon, &pl_attribs.taskbar_icon);
+    let class_name = register_window_class::<T>();
 
     let mut window_flags = WindowFlags::empty();
     window_flags.set(WindowFlags::MARKER_DECORATIONS, attributes.decorations);
@@ -1030,21 +1031,9 @@ where
     Ok(initdata.window.unwrap())
 }
 
-unsafe fn register_window_class<T: 'static>(
+unsafe fn register_window_class<T: 'static>() -> Vec<u16> {
-    window_icon: &Option<Icon>,
-    taskbar_icon: &Option<Icon>,
-) -> Vec<u16> {
     let class_name = util::encode_wide("Window Class");
 
-    let h_icon = taskbar_icon
-        .as_ref()
-        .map(|icon| icon.inner.as_raw_handle())
-        .unwrap_or(0);
-    let h_icon_small = window_icon
-        .as_ref()
-        .map(|icon| icon.inner.as_raw_handle())
-        .unwrap_or(0);
-
     use windows_sys::Win32::Graphics::Gdi::COLOR_WINDOWFRAME;
     let class = WNDCLASSEXW {
         cbSize: mem::size_of::<WNDCLASSEXW>() as u32,
@@ -1053,12 +1042,12 @@ unsafe fn register_window_class<T: 'static>(
         cbClsExtra: 0,
         cbWndExtra: 0,
         hInstance: util::get_instance_handle(),
-        hIcon: h_icon,
+        hIcon: 0,
         hCursor: 0, // must be null in order for cursor state to work properly
         hbrBackground: COLOR_WINDOWFRAME as _,
         lpszMenuName: ptr::null(),
         lpszClassName: class_name.as_ptr(),
-        hIconSm: h_icon_small,
+        hIconSm: 0,
     };
 
     // We ignore errors because registering the same window class twice would trigger

src/platform_impl/windows/window_state.rs

@@ -123,7 +123,6 @@ pub enum ImeState {
 impl WindowState {
     pub(crate) fn new(
         attributes: &WindowAttributes,
-        taskbar_icon: Option<Icon>,
         scale_factor: f64,
         current_theme: Theme,
         preferred_theme: Option<Theme>,
@@ -140,7 +139,7 @@ impl WindowState {
             max_size: attributes.max_inner_size,
 
             window_icon: attributes.window_icon.clone(),
-            taskbar_icon,
+            taskbar_icon: None,
 
             saved_window: None,
             scale_factor,