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

13 Jan 2025

      Hi Hans (et al),

On Mon, Jan 13, 2025 at 08:49 (+0100), Hans Hagen via ntg-context wrote:
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On 1/13/2025 7:44 AM, Mikael Sundqvist wrote:
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Hi,
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On Mon, Jan 13, 2025 at 1:43 AM Jim mailto:zlists%2Bcontext@jdvb.ca> wrote:
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Hi,
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In plain TeX,
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$$\smash{\sum_0^n}$$
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is set in \displaystyle, just like
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$$\smash{\sum_0^n}$$
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However, ConTeXt
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\starttext
    $$\smash{\sum^0_n}$$
    \stoptext
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outputs the above in \textstyle, whereas
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\starttext
    $$\sum^0_n$$
    \stoptext
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is in (of course(?)) \displaystyle.
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Is this difference intentional?
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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.)
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/Mikael
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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.
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% put this in cont-new.mkxl
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\unprotect
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\protected\def\syst_boxes_math_set_nextbox#1%
  {\setbox\nextbox\hbox\expandafter\bgroup
     \expandafter\Ustartmathmode\the\mathstyle
     \mathsurround\zeropoint{#1}%
     \Ustopmathmode
   \egroup}
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\protect
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to get this right
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\starttext
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\ruledhbox{\smash{$\sum^0_n$}} \blank
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\ruledhbox{\smash{$\displaystyle\sum^0_n$}} \blank
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\ruledhbox{$\smash{\sum^0_n}$} \blank
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\ruledhbox{$\displaystyle\smash{\sum^0_n}$} \blank
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\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