Window::set_minimized (#985) (#990)

* Expose set_minimized. Implement for macOS (#985)

* Implement set_minimized for Wayland (#985)

Co-Authored-By: Victor Berger <vberger@users.noreply.github.com>

* Implement set_minimized for Windows (#985)

* Remove debug logs (#985)

* Implement Window::set_minimized for X11

* Remove extra param from set_window_flags call

* Cargo fmt

* Add example of usage

* Update changelog

* Update feature matrix

* Cargo fmt

* Update example to remove unnecessary event var

* Stop setting window styles when minimizing (#985)

* Add stub for WASM (#985)

Co-authored-by: Victor Berger <vberger@users.noreply.github.com>
Co-authored-by: Murarth <murarth@gmail.com>
Co-authored-by: Freya Gentz <zegentzy@protonmail.com>
Co-authored-by: Osspial <osspial@gmail.com>

src/platform_impl/windows/event_loop.rs

@@ -1145,7 +1145,18 @@ unsafe extern "system" fn public_window_callback<T>(
             0
         }
 
+        // this is necessary for us to maintain minimize/restore state
         winuser::WM_SYSCOMMAND => {
+            if wparam == winuser::SC_RESTORE {
+                let mut w = subclass_input.window_state.lock();
+                w.set_window_flags_in_place(|f| f.set(WindowFlags::MINIMIZED, false));
+            }
+            if wparam == winuser::SC_MINIMIZE {
+                let mut w = subclass_input.window_state.lock();
+                w.set_window_flags_in_place(|f| f.set(WindowFlags::MINIMIZED, true));
+            }
+            // Send `WindowEvent::Minimized` here if we decide to implement one
+
             if wparam == winuser::SC_SCREENSAVE {
                 let window_state = subclass_input.window_state.lock();
                 if window_state.fullscreen.is_some() {

src/platform_impl/windows/window.rs

@@ -452,6 +452,18 @@ impl Window {
         WindowId(self.window.0)
     }
 
+    #[inline]
+    pub fn set_minimized(&self, minimized: bool) {
+        let window = self.window.clone();
+        let window_state = Arc::clone(&self.window_state);
+
+        self.thread_executor.execute_in_thread(move || {
+            WindowState::set_window_flags(window_state.lock(), window.0, |f| {
+                f.set(WindowFlags::MINIMIZED, minimized)
+            });
+        });
+    }
+
     #[inline]
     pub fn set_maximized(&self, maximized: bool) {
         let window = self.window.clone();

src/platform_impl/windows/window_state.rs

@@ -79,6 +79,8 @@ bitflags! {
         /// window's state to match our stored state. This controls whether to accept those changes.
         const MARKER_RETAIN_STATE_ON_SIZE = 1 << 10;
 
+        const MINIMIZED = 1 << 11;
+
         const FULLSCREEN_AND_MASK = !(
             WindowFlags::DECORATIONS.bits |
             WindowFlags::RESIZABLE.bits |
@@ -212,6 +214,9 @@ impl WindowFlags {
         if self.contains(WindowFlags::CHILD) {
             style |= WS_CHILD; // This is incompatible with WS_POPUP if that gets added eventually.
         }
+        if self.contains(WindowFlags::MINIMIZED) {
+            style |= WS_MINIMIZE;
+        }
         if self.contains(WindowFlags::MAXIMIZED) {
             style |= WS_MAXIMIZE;
         }
@@ -276,14 +281,30 @@ impl WindowFlags {
             }
         }
 
+        // Minimize operations should execute after maximize for proper window animations
+        if diff.contains(WindowFlags::MINIMIZED) {
+            unsafe {
+                winuser::ShowWindow(
+                    window,
+                    match new.contains(WindowFlags::MINIMIZED) {
+                        true => winuser::SW_MINIMIZE,
+                        false => winuser::SW_RESTORE,
+                    },
+                );
+            }
+        }
+
         if diff != WindowFlags::empty() {
             let (style, style_ex) = new.to_window_styles();
 
             unsafe {
                 winuser::SendMessageW(window, *event_loop::SET_RETAIN_STATE_ON_SIZE_MSG_ID, 1, 0);
 
-                winuser::SetWindowLongW(window, winuser::GWL_STYLE, style as _);
-                winuser::SetWindowLongW(window, winuser::GWL_EXSTYLE, style_ex as _);
+                // This condition is necessary to avoid having an unrestorable window
+                if !new.contains(WindowFlags::MINIMIZED) {
+                    winuser::SetWindowLongW(window, winuser::GWL_STYLE, style as _);
+                    winuser::SetWindowLongW(window, winuser::GWL_EXSTYLE, style_ex as _);
+                }
 
                 let mut flags = winuser::SWP_NOZORDER
                     | winuser::SWP_NOMOVE