[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] `primitiveScreenScaleFactor` broken on headless Linux/X11 VMs (Issue #625)

[Marcel Taeumel]

I see. There is a difference betwen `--headless` and `--nodisplay`. The former still uses `vm-display-X11` but frees certain variables. That then requires checks for the `headless` variable such as in `display_ioScreenSize`.

There are no such checks in `display_ioScreenScaleFactor`. That's the bug? 

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