[luatex] Subscript drop too large

[Hans Hagen]

On 9/27/2018 12:37 PM, Henri Menke wrote:
> On 9/27/18 7:50 PM, Hans Hagen wrote:
>> On 9/27/2018 7:23 AM, Henri Menke wrote:
>>> Dear list,
>>>
>>> When using a Unicode math font, the subscript drop increases by a lot.
>>> It does not seem to be font dependent, so it's likely an engine issue.
>>> Is there any parameter which I could tweak?
>>
>> all kind of math parameters .. like
>>
>> $ \the\Umathsubshiftdrop\textstyle\quad {gt}_{gt} $
>> $ \Umathsubshiftdrop\textstyle.2ex      {gt}_{gt} $
> 
> This partly answers the question, but it seems that there is something
> wrong with subscripts after boxes, see MWE below.  With XeTeX it looks
> okay and the drop is basically the same with and without a Unicode math
> font, but with LuaTeX the drop after the box is much larger with a
> Unicode math font whereas the drop after a regular atom is the same.
> 
> \ifdefined\directlua
>    \input luaotfload.sty
> \fi
> \font\math="Latin Modern Math" at 10pt
> $\hbox{gt}_{gt} gt_{gt}$
> \textfont0=\math
> $\hbox{gt}_{gt} gt_{gt}$

- fwiw i only test in context (i don't know wnat luaotfload does with math)

- afaiks your \math font is not set up as math

Hans


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