[Qt-interest] [Xlib] How to show external Qt window by its X11 id

[Former LOR Anonymous]

Hello. I'd like to show external completely hidden (NOT iconified) X11
window (from Qt application). I can determine it's window id. But when
I use XMapWindow(), it becomes visible but without any contents, and I
also cannot close it, close button doesn't work at all. Ay ideas how
to fix it? Thanks!

-- 
Regards, Krasu.