We also have to validate the frame to avoid an infinite loop when the
app doesn't call BeginPaint.

windows/message.c

diff --git a/windows/message.c b/windows/message.c
index 715dc82..74757a2 100644
--- a/windows/message.c
+++ b/windows/message.c
@@ -2375,7 +2375,8 @@
 	    msg->hwnd);
 	wndPtr->flags &= ~WIN_NEEDS_BEGINPAINT;
         /* Validate the update region to avoid infinite WM_PAINT loop */
-        ValidateRect( msg->hwnd, NULL );
+        PAINT_RedrawWindow( wndPtr->hwndSelf, NULL, 0,
+                        RDW_FRAME | RDW_VALIDATE | RDW_NOCHILDREN | RDW_NOINTERNALPAINT, 0 );  
     }
 END:
     WIN_ReleaseWndPtr(wndPtr);