user32: Start checking for driver events more often when the app doesn't consume messages properly.

dlls/user32/message.c

@@ -3671,6 +3671,16 @@ void WINAPI PostQuitMessage( INT exit_code )
     SERVER_END_REQ;
 }
 
+/* check for driver events if we detect that the app is not properly consuming messages */
+static inline void check_for_driver_events(void)
+{
+    if (get_user_thread_info()->message_count > 200)
+    {
+        flush_window_surfaces( FALSE );
+        USER_Driver->pMsgWaitForMultipleObjectsEx( 0, NULL, 0, QS_ALLINPUT, 0 );
+    }
+    else get_user_thread_info()->message_count++;
+}
 
 /***********************************************************************
  *		PeekMessageW  (USER32.@)
@@ -3680,6 +3690,7 @@ BOOL WINAPI DECLSPEC_HOTPATCH PeekMessageW( MSG *msg_out, HWND hwnd, UINT first,
     MSG msg;
 
     USER_CheckNotLock();
+    check_for_driver_events();
 
     if (!peek_message( &msg, hwnd, first, last, flags, 0 ))
     {
@@ -3726,6 +3737,7 @@ BOOL WINAPI DECLSPEC_HOTPATCH GetMessageW( MSG *msg, HWND hwnd, UINT first, UINT
     unsigned int mask = QS_POSTMESSAGE | QS_SENDMESSAGE;  /* Always selected */
 
     USER_CheckNotLock();
+    check_for_driver_events();
 
     if (first || last)
     {

dlls/user32/user_private.h

@@ -172,7 +172,8 @@ struct wm_char_mapping_data
 struct user_thread_info
 {
     HANDLE                        server_queue;           /* Handle to server-side queue */
-    DWORD                         recursion_count;        /* SendMessage recursion counter */
+    WORD                          recursion_count;        /* SendMessage recursion counter */
+    WORD                          message_count;          /* Get/PeekMessage loop counter */
     BOOL                          hook_unicode;           /* Is current hook unicode? */
     HHOOK                         hook;                   /* Current hook */
     struct received_message_info *receive_info;           /* Message being currently received */

dlls/user32/winproc.c

@@ -1126,6 +1126,7 @@ static DWORD wait_message( DWORD count, CONST HANDLE *handles, DWORD timeout, DW
 {
     DWORD ret = USER_Driver->pMsgWaitForMultipleObjectsEx( count, handles, timeout, mask, flags );
     if (ret == WAIT_TIMEOUT && !count && !timeout) NtYieldExecution();
+    if ((mask & QS_INPUT) == QS_INPUT) get_user_thread_info()->message_count = 0;
     return ret;
 }