Possible regression on master regarding integral limit

[Jean-Marc Lasgouttes]

Le 02/09/2020 à 23:21, Enrico Forestieri a écrit :
> The suspect being f96b99dc, where the way the math parser deals with
> \limits was changed. Now, \limits gets swallowed on reloading a document.

Indeed, I was too lazy to define limits_ in InsetMathMacro::Private, and 
the consequence is that it was not copied on clone(). Should be fixed now.

JMarc