From 18a5d40ba3ed196ee44142f4d6eda787f8e17428 Mon Sep 17 00:00:00 2001
From: Rodrigo Rivas Costa <rodrigorivascosta@gmail.com>
Date: Sun, 14 Sep 2025 19:49:31 +0200
Subject: [PATCH] Fix 'no-decorations' in Windows.

In Windows, an overlapped window that used
`with_decorations(false)` didn't have the
proper styles.
---
 winit-win32/src/window_state.rs   | 13 +++++++------
 winit/src/changelog/unreleased.md |  1 +
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/winit-win32/src/window_state.rs b/winit-win32/src/window_state.rs
index 78b36e5221..31c51fa385 100644
--- a/winit-win32/src/window_state.rs
+++ b/winit-win32/src/window_state.rs
@@ -295,12 +295,13 @@ impl WindowFlags {
         }
         if self.contains(WindowFlags::CHILD) {
             style |= WS_CHILD; // This is incompatible with WS_POPUP if that gets added eventually.
-
-            // Remove decorations window styles for child
-            if !self.contains(WindowFlags::MARKER_DECORATIONS) {
-                style &= !(WS_CAPTION | WS_BORDER);
-                style_ex &= !WS_EX_WINDOWEDGE;
-            }
+        }
+        if !self.contains(WindowFlags::MARKER_DECORATIONS) {
+            // WS_CAPTION is equal to (WS_BORDER | WS_DLGFRAME)
+            // The former is intended for overlapped windows,
+            // the latter are for child windows.
+            style &= !(WS_CAPTION | WS_SIZEBOX);
+            style_ex &= !WS_EX_WINDOWEDGE;
         }
         if self.contains(WindowFlags::POPUP) {
             style |= WS_POPUP;
diff --git a/winit/src/changelog/unreleased.md b/winit/src/changelog/unreleased.md
index c59decc82a..79622c67ce 100644
--- a/winit/src/changelog/unreleased.md
+++ b/winit/src/changelog/unreleased.md
@@ -264,3 +264,4 @@ changelog entry.
 - On Windows, `Window::theme` will return the correct theme after setting it through `Window::set_theme`.
 - On Windows, `Window::set_theme` will change the title bar color immediately now.
 - On Windows 11, prevent incorrect shifting when dragging window onto a monitor with different DPI.
+- On Windows, `with_decoration(false)` works for overlapped (non child) windows.