Re: [Dev-luatex] letter spacing in display math

It's not a LuaTeX bug, let's discuss this in luaotfload.

Ok. I'll file a bug there.

I feel like letterspacing being applied in inline math is much less expected than it not being applied in display math since it really seems like a text feature. What's the usecase for letterspacing in math?

Usually TeX adds italic correction to do some pseudo-letterspacing in math mode. (The difference between normal math and \mathit.) For fonts without italic correction, using a fixed letterspacing does something similar. In fact, I prefer it this way since the spacing is less uneven. Achim