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I noticed that when I open old xws files the fonts and colors are often different. It appears they are controlled with something inside the xws file. I see a lot of data I can't decipher. Can you tell me what part of the xws file controls fonts and colors?

Matt

Colors are controlled globally in the ~/.xcasrc or xcas.rc configuration file (in the widget_size command). There is no way to control them inside individual sessions.

I have attached 3 .xws files that open with different colors and fonts on my machine (Win 10 64 bit 20H2). I am running the 64 bit cygwin version 1.7.0-29. Do these open and look different from each other for you?

Matt

The difference is that your sessions made with old versions of Xcas have different commandline widgets, and the old ones do not provide syntax highlighting.
old: // fltk N4xcas19Multiline_Input_tabE 19 -168 866 24 14 0
new: // fltk N4xcas16Xcas_Text_EditorE 11 56 854 25 14 0

Excellent.

Thanks
Matt