title: Child window freeze if opened during parent window resize
body: <p>I have some window. User can drag it, resize etc. At some point there can be a message that should be shown in modal window. I'm creating such a window as child and setting parent window to disabled. Everything works ok except the case when I'm dragging a parent window during the child creation. I used spy to see messages and found that in that case my child window doesn't receives <code>WM_ENTERSIZEMOVE</code> message. It seems that parent's <code>WM_ENTERSIZEMOVE</code> blocks one for child. I tried to manually send <code>WM_EXITSIZEMOVE</code> for the parent but unfortunatelly this doesn't works.</p>