First received WM_NCCALCSIZE message, If wParam is FALSE, lParam points to a RECT structure. null error

[Ewkoll]

https://docs.microsoft.com/en-us/windows/win32/winmsg/wm-nccalcsize

If wParam is TRUE, lParam points to an NCCALCSIZE_PARAMS structure that contains information an application can use to calculate the new size and position of the client rectangle.

If wParam is FALSE, lParam points to a RECT structure. On entry, the structure contains the proposed window rectangle for the window. On exit, the structure should contain the screen coordinates of the corresponding window client area.

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[haoguo]

Same issue. This happens on some specific machines. I don't know much about this windows message mechanism. I simply changed as below then it works.

[abutcher-gh]

See #100 which fixes this.