[NTG-context] Re: How hard should something get \smash-ed ?

[Jim <zlists+context@jdvb.ca>]

Hi Hans (et al),

On Mon, Jan 13, 2025 at 08:49 (+0100), Hans Hagen via ntg-context wrote:

> On 1/13/2025 7:44 AM, Mikael Sundqvist wrote:
>> Hi,

>> On Mon, Jan 13, 2025 at 1:43 AM Jim <zlists+context@jdvb.ca
>> <mailto:zlists%2Bcontext@jdvb.ca>> wrote:

>> Hi,

>> In plain TeX,

>>     $$\smash{\sum_0^n}$$

>> is set in \displaystyle, just like

>>     $$\smash{\sum_0^n}$$


>> However, ConTeXt

>>     \starttext
>>     $$\smash{\sum^0_n}$$
>>     \stoptext

>> outputs the above in \textstyle, whereas

>>     \starttext
>>     $$\sum^0_n$$
>>     \stoptext

>> is in (of course(?)) \displaystyle.

>> Is this difference intentional?


>> Thanks for reporting. I don't think it is intentional. (Can you show
>> your real world example where \smash is needed? It seems to not really
>> be used in any macro in ConTeXt.)

>> /Mikael

>> PS $$ is not meant to be used in ConTeXt. If you want inline math in
>> display style, use \dm {}, and if you want displayed formulas in display
>> style, use \startformula \stopformula.


> % put this in cont-new.mkxl

> \unprotect

> \protected\def\syst_boxes_math_set_nextbox#1%
>   {\setbox\nextbox\hbox\expandafter\bgroup
>      \expandafter\Ustartmathmode\the\mathstyle
>      \mathsurround\zeropoint{#1}%
>      \Ustopmathmode
>    \egroup}

> \protect

> to get this right

> \starttext

> \ruledhbox{\smash{$\sum^0_n$}} \blank

> \ruledhbox{\smash{$\displaystyle\sum^0_n$}} \blank

> \ruledhbox{$\smash{\sum^0_n}$} \blank

> \ruledhbox{$\displaystyle\smash{\sum^0_n}$} \blank

> \stoptext

Thanks Hans, that fixes that up nicely.

(And it is always nice to see a fix which actually makes the codebase (a
bit) shorter.

                                Jim
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