Computer Modern text in \mathrm

[datMaffin]

Screenshot:

I resolved the problem by using the second solution of the Stack Overflow answer https://tex.stackexchange.com/a/394137:

1. Add [NFSSFamily=ntxtlf] to \setmainfont.
2. Remove the old solution (as described in the same Stack Overflow question https://tex.stackexchange.com/a/394139/9075):
   • From https://github.com/latextemplates/scientific-thesis-template/blob/master/config.tex#L93 to https://github.com/latextemplates/scientific-thesis-template/blob/master/config.tex#L138
3. Move \RequirePackage{newtxmath} below Fontspec commands.

Except for the now correct font in \mathrm I was only able to spot a difference in the rendering of the equals sign. Everything else looks exactly the same!

Since I am not sure about the implications of this change, I am not creating a pull request.

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Latex Setup: MacTex / TexLive 2019 with the latest updates

[koppor]

Just go ahead with the PR. It is more easy to play around if a solution is proposed. I would just quickly check it (as I am currently applying fixes and not fully developing the template).

Side note: I am working on https://github.com/latextemplates/generator-latex-template to enable better tests for changes.

[koppor]

Is this fixed by #113?

[datMaffin]

Yes #113 was the original fix.

It will also still work with #142 (using unicode-math for lualatex).