user32: Don't flush window surfaces while waiting for a sent message reply.

dlls/user32/message.c

@@ -3682,8 +3682,8 @@ BOOL WINAPI DECLSPEC_HOTPATCH PeekMessageW( MSG *msg_out, HWND hwnd, UINT first,
 
     if (!peek_message( &msg, hwnd, first, last, flags, 0 ))
     {
-        if (flags & PM_NOYIELD) flush_window_surfaces( FALSE );
-        else wow_handlers.wait_message( 0, NULL, 0, 0, 0 );
+        flush_window_surfaces( !(flags & PM_NOYIELD) );
+        if (!(flags & PM_NOYIELD)) wow_handlers.wait_message( 0, NULL, 0, 0, 0 );
         return FALSE;
     }
 
@@ -3739,6 +3739,7 @@ BOOL WINAPI DECLSPEC_HOTPATCH GetMessageW( MSG *msg, HWND hwnd, UINT first, UINT
 
     while (!peek_message( msg, hwnd, first, last, PM_REMOVE | (mask << 16), mask ))
     {
+        flush_window_surfaces( TRUE );
         wow_handlers.wait_message( 1, &server_queue, INFINITE, mask, 0 );
     }
 
@@ -4071,6 +4072,7 @@ DWORD WINAPI MsgWaitForMultipleObjectsEx( DWORD count, CONST HANDLE *pHandles,
     for (i = 0; i < count; i++) handles[i] = pHandles[i];
     handles[count] = get_server_queue_handle();
 
+    flush_window_surfaces( TRUE );
     return wow_handlers.wait_message( count+1, handles, timeout, mask, flags );
 }
 

dlls/user32/winproc.c

@@ -1124,10 +1124,7 @@ static LRESULT WINAPI StaticWndProcW( HWND hwnd, UINT msg, WPARAM wParam, LPARAM
 
 static DWORD wait_message( DWORD count, CONST HANDLE *handles, DWORD timeout, DWORD mask, DWORD flags )
 {
-    DWORD ret;
-
-    flush_window_surfaces( TRUE );
-    ret = USER_Driver->pMsgWaitForMultipleObjectsEx( count, handles, timeout, mask, flags );
+    DWORD ret = USER_Driver->pMsgWaitForMultipleObjectsEx( count, handles, timeout, mask, flags );
     if (ret == WAIT_TIMEOUT && !count && !timeout) NtYieldExecution();
     return ret;
 }