Wrong positioning of \vec at sizes 8pt or less

[isaacsb]

Since at least release 2.10, \vec (also \overrightarrow with single character) is too much to the left at font sizes 8pt or less. Same results with lualatex and xelatex (using unicode-math). Haven't tried with Word or plain TeX. Same results when in subscript at 12pt or less.

It does not happen with \overleftarrow.

---

Example:

\documentclass{standalone}
\usepackage{unicode-math}
\setmathfont{STIX Two Math}
\newcommand\testa[1]{\fontsize{#1}{18}\selectfont {#1}pt: $\vec{v}$}
\newcommand\testb[1]{\fontsize{#1}{18}\selectfont {#1}pt: $\partial_{\vec{v}} f$}
\begin{document}
\testa{7} \quad \testa{8} \quad \testa{9} \quad \testa{10} \quad \testb{10} \quad \testb{11} \quad \testb{12} \quad \testb{13}
\end{document}

Using version 2.02 b142: v2.02-b142.pdf

Using version 2.12 b168a (also 2.10+): v2.12-b168a.pdf

[tiroj]

Thanks. Will review possible causes for this issue and plan a fix for either v2.20 or an intermediate bug fix release. Strange that it is only affecting some sizes.

[firai]

By the way, this doesn't seem to be an issue with Word: 1st line: 11 pt. 2nd line: 7 pt.

(Produced with STIX Two Math 2.12 b168a and Word 16 [a.k.a. Office 365])

[tiroj]

Will check for related MATH table settings, but if this is not happening in MS Word then possibly the issue is in the TeX flavours?

[davidmjones]

Will check for related MATH table settings, but if this is not happening in MS Word then possibly the issue is in the TeX flavours?

Yes. This is related to #162. By default, the unicode-math package used by both XeTeX and luaTeX turns on the ssty1 feature for any font sizes between 7 and 10pt. [Sorry for not twigging on to the relevance of that to this issue sooner.]

[tiroj]

Yikes! So this is something that probably will end up getting fixed in the v2.20 work, as a free rider on improved ssty glyph support.