[3dprinter-general] Bug#1022234: Cash in Prusa-Slicer

[Thomas Viehmann]

Hi,

so the crash reported here seems to be due to the font not being 
initialized (it is passed as NULL in the traceback).
If we initialize a frame before calling the CalcTextsize, this works - 
see the attached.
It still prints errors "could not initialize glew" and the plater tab 
does not render, but I guess this is a first step towards something.

Best regards

Thomas
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