U+02D2-02D7 should bet centered, not low

[moyogo]

Describe the bug
U+02D2-02D7 ˒˓˔˕˖˗ should be centered, like hyphen, not low.

Screenshots

U+02D2-02D7 are currently low in the fonts that have them:

[alerque]

Thanks for the report. Contributions are always welcome. Do you have sources for your proof sheet there? That kind of thing (in LaTeX, SILE, Typst, whatever) is handy for checking specific changes like this.

[alerque]

I created some scratch tests to look at this in other fonts:

SILE source

\begin[papersize=a7]{document}
\nofolios
\neverindent
\use[module=packages.color]
\begin{lua}

SILE.settings:set("document.rskip", SILE.types.node.hfillglue())
SILE.settings:set("document.spaceskip", SILE.types.length("1spc", 0, 0))

SILE.registerCommand("font-v", function (_, _)
   local face = SILE.font.cache(SILE.font.loadDefaults({}), SILE.shaper.getFace)
   local ot = require("core.opentype-parser")
   local font = ot.parseFont(face)
   local name = font.names[4]["en-US"][1]
   local size = SILE.settings:get("font.size")
   local version = font.names[5]["en-US"][1]:gsub(";.*", "")
   SILE.call("skip", { height = "-0.8em" })
   SILE.call("font", { size = "0.2em" }, function ()
      SILE.call("color", { color = "#7f7f7f" }, { ("%s %spt, %s"):format(name, size, version) })
   end)
   SILE.call("skip", { height = "-0.4em" })
end)

\end{lua}
\define[command=ts]{x˒˓˔˕˖˗x\font-v}
\font[size=20pt]

\font[family=Libertinus Serif]{\ts}

\font[family=Gentium Plus]{\ts}

\font[family=Charis SIL]{\ts}

\font[family=Brill]{\ts}

\font[family=Junicode]{\ts}

\font[family=Noto Serif]{\ts}

\font[family=TeX Gyre Termes]{\ts}

\font[family=Linux Libertine]{\ts}

\end{document}

I'm not familiar with these code points or their use. Do you have some references for where and how they might be used in context? It looks like besides moving them all up, we might also want to align them a little differently relative to each-other.

[moyogo]

They were IPA symbols, variants of marks below.
See https://commons.wikimedia.org/wiki/File:IPA_chart_1951.jpg

A few language orthographies may use ˖ U+02D6 and ˗ U+02D7 for tone marking, as ꞉ U+A789 and ꞊ U+A78A.