winit-win32: Fix Window focus after showing hidden maximized window

Author: rhysd

winit-win32/src/window_state.rs

@@ -345,12 +345,15 @@ impl WindowFlags {
         }
 
         if new.contains(WindowFlags::VISIBLE) {
-            let flag = if !self.contains(WindowFlags::MARKER_ACTIVATE) {
-                self.set(WindowFlags::MARKER_ACTIVATE, true);
-                SW_SHOWNOACTIVATE
-            } else {
-                SW_SHOW
-            };
+            let flag =
+                if new.contains(WindowFlags::MAXIMIZED) && diff.contains(WindowFlags::VISIBLE) {
+                    SW_MAXIMIZE
+                } else if !self.contains(WindowFlags::MARKER_ACTIVATE) {
+                    self.set(WindowFlags::MARKER_ACTIVATE, true);
+                    SW_SHOWNOACTIVATE
+                } else {
+                    SW_SHOW
+                };
             unsafe {
                 ShowWindow(window, flag);
             }
@@ -379,7 +382,10 @@ impl WindowFlags {
             }
         }
 
-        if diff.contains(WindowFlags::MAXIMIZED) || new.contains(WindowFlags::MAXIMIZED) {
+        if (diff.contains(WindowFlags::MAXIMIZED) || new.contains(WindowFlags::MAXIMIZED))
+            && new.contains(WindowFlags::VISIBLE)
+            && !diff.contains(WindowFlags::VISIBLE)
+        {
             unsafe {
                 ShowWindow(window, match new.contains(WindowFlags::MAXIMIZED) {
                     true => SW_MAXIMIZE,

winit/src/changelog/unreleased.md

@@ -61,3 +61,4 @@ changelog entry.
 - On Wayland, switch from using the `ahash` hashing algorithm to `foldhash`.
 - On macOS, fix borderless game presentation options not sticking after switching spaces.
 - On macOS, fix IME being locked on (regardless of requests to disable) after being enabled once.
+- On Windows, fix missing focus events after showing a hidden maximized window.