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Qt5 dummy widget with size 75x32 is visible on app start

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zeljko:
I think that guy does not understand exact problem. _NET_FRAME_EXTENTS can be used when an X window is mapped, but LCL needs such info before window is mapped by wm. That's exact reason why I'm created dummy window before Application.MainForm is mapped, but created so it is really mainform for Qt and LCL. There's already _NET_FRAME_EXTENTS function in qtx11.inc in lcl/interfaces/qt(5)/
 see AskX11_NET_REQUEST_FRAME_EXTENTS() there ...it simply does not work as expected by LCL, also see Qt(5) known problems about x11.

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