`math-style` affects Upright/Italic Mathematical Symbols

[e-kwsm]

Description

Passing math-style=ISO makes upright Greek symbols (e.g., \mupGamma) italic. Passing math-style=upright makes italic Latins and Greek symbols (e.g., \mitA and \mitGamma) upright.

Check/indicate

• [x] Relevant for XeTeX
• [x] Relevant for LuaTeX
• [x] Issue tracker has been searched for similar issues?
• [ ] Links to discussion if appropriate

Minimal example demonstrating the issue

\documentclass[]{article}
\def\mathstyle{math-style=upright}
\usepackage[\mathstyle]{unicode-math}
\setmathfont{texgyrepagella-math.otf}
\begin{document}
\texttt{\mathstyle}

\begin{tabular}{cccccccc}
  \verb|A| & \verb|\mitA| & \verb|\Gamma| & \verb|Γ| & \verb|\itGamma| & \verb|\mitGamma| & \verb|\upGamma| & \verb|\mupGamma| \\
  \hline
  {}   $A$ &      $\mitA$ &      $\Gamma$ &      $Γ$ &      $\itGamma$ &      $\mitGamma$ &      $\upGamma$ &      $\mupGamma$ \\
\end{tabular}

\end{document}

Further details

I expect that \mupGamma is upright and \mitA and \mitGamma are italic regardless of math-style, like \upGamma and \itGamma.

https://github.com/wspr/unicode-math/blob/19f569d8449059a2e663f01ad8aae20a060c7235/um-doc-main.tex#L525-L527

Is this intended?

My Environment

• LuaTeX: 1.07.0 (TeX Live 2018)
• XeTeX: 3.14159265-2.6-0.99999 (TeX Live 2018)
• unicode-math: 2018/07/29 vv0.8m

[wspr]

Sorry, this is poorly explained in the documentation. \mupgamma is upright gamma as an “input character". It is identical to typing in the matching unicode char.

The idea of u-m is to then normalise the input chars to receive consistent output. If you want to specify an “output glyph" you need to use either \symup / \symit or one of the shorthands like \upgamma / \itgamma.

And if you don’t like the normalisation for some reason, then there’s math-style=literal :)

[e-kwsm]

I understand, thanks.