windows: fix the event loop not waking on accessibility requests

Fixes #4055.

src/changelog/unreleased.md

@@ -39,3 +39,7 @@ The migration guide could reference other migration examples in the current
 changelog entry.
 
 ## Unreleased
+
+### Fixed
+
+- On Windows, fixed the event loop not waking on accessibility requests.

src/platform_impl/windows/event_loop.rs

@@ -48,7 +48,7 @@ use windows_sys::Win32::UI::WindowsAndMessaging::{
     RegisterClassExW, RegisterWindowMessageA, SetCursor, SetWindowPos, TranslateMessage,
     CREATESTRUCTW, GIDC_ARRIVAL, GIDC_REMOVAL, GWL_STYLE, GWL_USERDATA, HTCAPTION, HTCLIENT,
     MINMAXINFO, MNC_CLOSE, MSG, MWMO_INPUTAVAILABLE, NCCALCSIZE_PARAMS, PM_REMOVE, PT_PEN,
-    PT_TOUCH, QS_ALLEVENTS, RI_MOUSE_HWHEEL, RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE,
+    PT_TOUCH, QS_ALLINPUT, RI_MOUSE_HWHEEL, RI_MOUSE_WHEEL, SC_MINIMIZE, SC_RESTORE,
     SIZE_MAXIMIZED, SWP_NOACTIVATE, SWP_NOMOVE, SWP_NOSIZE, SWP_NOZORDER, WHEEL_DELTA, WINDOWPOS,
     WMSZ_BOTTOM, WMSZ_BOTTOMLEFT, WMSZ_BOTTOMRIGHT, WMSZ_LEFT, WMSZ_RIGHT, WMSZ_TOP, WMSZ_TOPLEFT,
     WMSZ_TOPRIGHT, WM_CAPTURECHANGED, WM_CLOSE, WM_CREATE, WM_DESTROY, WM_DPICHANGED,
@@ -745,11 +745,12 @@ fn wait_for_messages_impl(
         let (num_handles, raw_handles) =
             if use_timer { (1, [high_resolution_timer.unwrap()]) } else { (0, [ptr::null_mut()]) };
 
+        // We must use `QS_ALLINPUT` to wake on accessibility messages.
         let result = MsgWaitForMultipleObjectsEx(
             num_handles,
             raw_handles.as_ptr() as *const _,
             wait_duration_ms,
-            QS_ALLEVENTS,
+            QS_ALLINPUT,
             MWMO_INPUTAVAILABLE,
         );
         if result == WAIT_FAILED {