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Wrong kerning in math between w and subscript-j #301

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nagmat84 opened this issue Mar 2, 2020 · 6 comments
Closed

Wrong kerning in math between w and subscript-j #301

nagmat84 opened this issue Mar 2, 2020 · 6 comments

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@nagmat84
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@nagmat84 nagmat84 commented Mar 2, 2020

Describe the bug

In mathematics, a base symbol w followed by a subscript j have too much space while at the same time the j and the following letter nearly collide. The overall visual appearance looks as if the subscript j actually belonged to the following letter but not to its true base symbol.

To Reproduce

Compile this MWE with LuaLaTeX or XeLaTeX

\documentclass{article}
\usepackage{libertinus}
\begin{document}
\(w_j q^j\) 
\end{document}

Expected behavior

The spacing between the w and the j should be smaller, the spacing between the j and the q should be bigger.

Screenshots

screenshot

Additional context

Also, see here: https://tex.stackexchange.com/q/530675/47156

@khaledhosny

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@khaledhosny khaledhosny commented Mar 2, 2020

I improved it a bit for XeTeX already, but for LuaTeX it is still broken because LuaTeX does not apply italic correction by default (for reasons beyond me).

@khaledhosny khaledhosny closed this Mar 2, 2020
@nagmat84

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@nagmat84 nagmat84 commented Mar 2, 2020

OK. Then, who is the correct addressee to whom I should post a bug report?

@khaledhosny

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@khaledhosny khaledhosny commented Mar 2, 2020

XeTeX output:
XeTeX output

@khaledhosny

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@khaledhosny khaledhosny commented Mar 2, 2020

LuaTeX developers.

@nagmat84

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@nagmat84 nagmat84 commented Mar 2, 2020

Sure thing. I hoped, you had an URL or mail address of the project. I was apparently unable to find it. Of course, there is http://www.luatex.org, but I hoped there would be something like a bug tracker or similar. It does not seem to be right, to post a bug to the legal contact of that website.

@waldyrious

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@waldyrious waldyrious commented Mar 2, 2020

Looking at the description of the mirror repository https://github.com/TeX-Live/luatex, it says:

for issues please contact the luatex mailing list

And in the support page at luatex.org/support.html there are two mailing lists mentioned (luatex and dev-luatex), whose archives are public and show recent activity. So I guess that's where bugs can be reported.

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