Fix ReceivedCharacter not working with Alt held on Windows (#1282)

* Fix ReceivedCharacter with Alt held on Windows

* Update CHANGELOG.md

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Unreleased
 
 - On macOS, fix application termination on `ControlFlow::Exit`
+- On Windows, fix missing `ReceivedCharacter` events when Alt is held.
 - On macOS, stop emitting private corporate characters in `ReceivedCharacter` events.
 - On X11, fix misreporting DPI factor at startup.
 - On X11, fix events not being reported when using `run_return`.

src/platform_impl/windows/event_loop.rs

@@ -1112,7 +1112,7 @@ unsafe extern "system" fn public_window_callback<T>(
             0
         }
 
-        winuser::WM_CHAR => {
+        winuser::WM_CHAR | winuser::WM_SYSCHAR => {
             use crate::event::WindowEvent::ReceivedCharacter;
             use std::char;
             let is_high_surrogate = 0xD800 <= wparam && wparam <= 0xDBFF;
@@ -1145,12 +1145,6 @@ unsafe extern "system" fn public_window_callback<T>(
             0
         }
 
-        // Prevents default windows menu hotkeys playing unwanted
-        // "ding" sounds. Alternatively could check for WM_SYSCOMMAND
-        // with wparam being SC_KEYMENU, but this may prevent some
-        // other unwanted default hotkeys as well.
-        winuser::WM_SYSCHAR => 0,
-
         winuser::WM_SYSCOMMAND => {
             if wparam == winuser::SC_SCREENSAVE {
                 let window_state = subclass_input.window_state.lock();