Retrieves the current height, in pixels, of the render window's client area.
The client area is the part of the window that can be accessed for rendering / drawing, in other words the part of the window that
isn't part of its borders or caption bar. If your window has no border and caption bar, this function will return the same value
as DX11 GET WINDOW HEIGHT.
Take note that the return value of this function isn't trustable if in fullscreen mode.

Return Dword = DX11 GET WINDOW CLIENT HEIGHT()

This function does not take any parameters.

The current client height of the render window, in pixels. The size of the window can be changed by the user by dragging its borders, maximizing it, etc. so if you allow this the size may change at runtime.

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