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VCL positioning
Window coordinates are parent relative, with exception of maState fields, they
have screen coordinates.
Every window has a parent window, usually the client area of an existing window,
otherwise the desktop window.
When a window is to be sized/moved, SetPosSize is called.
Since coordinates are the position/size of client area, we need to calculate
current window frame size/position and map to screen coordinates using the
owner window position as offset.
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