Fix hiding a maximized window On Windows (#2336)

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 hiding a maximized window.
 - On Android, `ndk-glue`'s `NativeWindow` lock is now held between `Event::Resumed` and `Event::Suspended`.
 - On Web, added `EventLoopExtWebSys` with a `spawn` method to start the event loop without throwing an exception.
 - Added `WindowEvent::Occluded(bool)`, currently implemented on macOS and X11.

src/platform_impl/windows/window_state.rs

@@ -106,7 +106,6 @@ bitflags! {
 
         const EXCLUSIVE_FULLSCREEN_OR_MASK = WindowFlags::ALWAYS_ON_TOP.bits;
         const NO_DECORATIONS_AND_MASK = !WindowFlags::RESIZABLE.bits;
-        const INVISIBLE_AND_MASK = !WindowFlags::MAXIMIZED.bits;
     }
 }
 
@@ -229,9 +228,6 @@ impl WindowFlags {
         if self.contains(WindowFlags::MARKER_EXCLUSIVE_FULLSCREEN) {
             self |= WindowFlags::EXCLUSIVE_FULLSCREEN_OR_MASK;
         }
-        if !self.contains(WindowFlags::VISIBLE) {
-            self &= WindowFlags::INVISIBLE_AND_MASK;
-        }
         if !self.contains(WindowFlags::DECORATIONS) {
             self &= WindowFlags::NO_DECORATIONS_AND_MASK;
         }
@@ -294,21 +290,17 @@ impl WindowFlags {
         new = new.mask();
 
         let diff = self ^ new;
+
         if diff == WindowFlags::empty() {
             return;
         }
 
-        if diff.contains(WindowFlags::VISIBLE) {
+        if new.contains(WindowFlags::VISIBLE) {
             unsafe {
-                ShowWindow(
+                ShowWindow(window, SW_SHOW);
-                    window,
-                    match new.contains(WindowFlags::VISIBLE) {
-                        true => SW_SHOW,
-                        false => SW_HIDE,
-                    },
-                );
             }
         }
+
         if diff.contains(WindowFlags::ALWAYS_ON_TOP) {
             unsafe {
                 SetWindowPos(
@@ -352,6 +344,12 @@ impl WindowFlags {
             }
         }
 
+        if !new.contains(WindowFlags::VISIBLE) {
+            unsafe {
+                ShowWindow(window, SW_HIDE);
+            }
+        }
+
         if diff != WindowFlags::empty() {
             let (style, style_ex) = new.to_window_styles();