Windows: Pass WM_SYSCHAR and WM_SYSKEYDOWN to DefWindowProc

Allows the ALT+Space menu to work

CHANGELOG.md

@@ -14,6 +14,7 @@ And please only add new entries to the top of this list, right below the `# Unre
 - On Wayland, `wayland-csd-adwaita` now uses `ab_glyph` instead of `crossfont` to render the title for decorations.
 - On Wayland, a new `wayland-csd-adwaita-crossfont` feature was added to use `crossfont` instead of `ab_glyph` for decorations.
 - On Wayland, if not otherwise specified use upstream automatic CSD theme selection.
+- On Windows, fixed ALT+Space shortcut to open window menu.
 
 # 0.27.2 (2022-8-12)
 

src/platform_impl/windows/event_loop.rs

@@ -1218,7 +1218,12 @@ unsafe fn public_window_callback_inner<T: 'static>(
                     });
                 }
             }
-            0
+
+            if msg == WM_SYSCHAR {
+                DefWindowProcW(window, msg, wparam, lparam)
+            } else {
+                0
+            }
         }
 
         WM_IME_STARTCOMPOSITION => {
@@ -1463,9 +1468,7 @@ unsafe fn public_window_callback_inner<T: 'static>(
 
         WM_KEYDOWN | WM_SYSKEYDOWN => {
             use crate::event::{ElementState::Pressed, VirtualKeyCode};
-            if msg == WM_SYSKEYDOWN && wparam == VK_F4 as usize {
-                DefWindowProcW(window, msg, wparam, lparam)
-            } else {
+            if msg != WM_SYSKEYDOWN || wparam != VK_F4 as usize {
                 if let Some((scancode, vkey)) = process_key_params(wparam, lparam) {
                     update_modifiers(window, userdata);
 
@@ -1492,6 +1495,11 @@ unsafe fn public_window_callback_inner<T: 'static>(
                         });
                     }
                 }
+            }
+
+            if msg == WM_SYSKEYDOWN {
+                DefWindowProcW(window, msg, wparam, lparam)
+            } else {
                 0
             }
         }