I see this as well (Ubuntu 18.04, wxWidgets 3.0.4 with GTK+ 3.22). While the KiCad preview window has a black background, the color scheme in the actual printout and the system preview window is correct (e.g. not black background).
It appears that the wxPrintPreview object is not guaranteed to have reliable operation on non-Windows systems, they have even noted that in the documentation page: https://docs.wxwidgets.org/3.1/classwx_print_preview.html. Perhaps something lower in the wxPrintPreview object call (outside KiCad) is causing this behavior on Linux?
I see this as well (Ubuntu 18.04, wxWidgets 3.0.4 with GTK+ 3.22). While the KiCad preview window has a black background, the color scheme in the actual printout and the system preview window is correct (e.g. not black background).
It appears that the wxPrintPreview object is not guaranteed to have reliable operation on non-Windows systems, they have even noted that in the documentation page: https:/ /docs.wxwidgets .org/3. 1/classwx_ print_preview. html. Perhaps something lower in the wxPrintPreview object call (outside KiCad) is causing this behavior on Linux?