red rectangle under one superscript

[Wolfgang Engelmann]

Am 10.02.20 um 11:39 schrieb Jean-Marc Lasgouttes:
> Le 10/02/2020 à 09:53, Wolfgang Engelmann a écrit :
>> I get a red rectangle under one superscript (see the attached lyx file)
>> I use debian bullseye and LyX Version 2.3.4 (Sonntag, 12. Januar 2020)
>>
>> Perhaps a bit academic, since the pdf output seems to be ok. But 
>> still: Why the red mark?
> 
> The red mark is what we put when a preview is supposedly too small, so 
> that people notice the math inset. The limit value is 10 pixels at 
> 100dpi, therefore the equivalent of 0.1 inch. It may be that we should 
> make the limit lower.
> 
> JMarc
ok, now I understand. Does this limit concern the lyx view or the pdf view?
Wolfgang