[LyX/master] Update math macro display when entering from above/balow

[Jean-Marc Lasgouttes]

Le 07/11/2023 à 18:22, Richard Kimberly Heck a écrit :
>> But since I have no proof or reason to believe than this extra metrics 
>> step is costly, I prefer to leave it like that for now.
> 
> Yes, I knew that would be ugly, but if it does end up being expensive....

Then I will fix it :) We probably have worse things to fix. For example, 
my recent debugging activities suggest that the metrics are computed twice!

JMarc