Prevent lock-up with a focus loop between two top level unmanaged
windows.

windows/x11drv/event.c

diff --git a/windows/x11drv/event.c b/windows/x11drv/event.c
index 530db1f..e9022e9 100644
--- a/windows/x11drv/event.c
+++ b/windows/x11drv/event.c
@@ -385,7 +385,7 @@
         wine_tsx11_unlock();
     }
 
-    if (event->detail != NotifyPointer && hWnd != GetForegroundWindow())
+    if (event->detail != NotifyPointer && event->detail != NotifyNonlinear && hWnd != GetForegroundWindow())
         SetForegroundWindow( hWnd );
 }