Today’s bane of my existence.
@TiroTypeworks
Are there any humane tools for editing math fonts, or everybody just does TTX with LaTeX preview?

@iorsh I still use the MS Math Editor. It is far from ideal, and parts are clunky, but it gives decent visual feedback for constants and some other data. Cut-in kerning is a pain in all tools because of lack of visual feedback. The best I have come up with is edit -> load font in Overleaf -> compille TeX doc -> review -> repeat.

The MATH plugin that @khaled made for Glyphs looks pretty good. The actual cut-in editing is faster than in the MS tool, but still no realtime visual feedback.

@iorsh This summation sign with subscript italic j is something else though. No matter what edits I make in the MATH table, the j just refuses to move any closer. It is doing my head in. Also, the /jitalic.ssty glyph seems to be sitting lower relative to the summation sign than other subscripts, and I am not sure what in the layout is causing that.
@TiroTypeworks I’m afraid neither LuaTeX, XeTeX, or Word apply math cut-ins for large operators. @iorsh

@khaled @iorsh Do you happen to know if there are similar limitations in TeX implementations regarding growing of

U+20D0 COMBINING LEFT HARPOON ABOVE

U+20D1 COMBINING RIGHT HARPOON ABOVE

All my above and below arrows are working (including below harpoons), but these two are not. I have checked that the MATH data is the same for all these signs.

@TiroTypeworks It might depend on how the symbol is used (it might be explicitly asking to not stretch the anchor), but the engine has no restrictions in this area AFAIK @iorsh
@khaled @iorsh Thanks. As far as I can tell, the test documents are all identically formatted, but will check again.