[LyX/master] Implement variable size bigops

[Jean-Marc Lasgouttes]

Le 23/07/2020 à 12:22, Enrico Forestieri a écrit :
> Here is an alternative patch. Please check whether the change in
> InsetMathSymbol.cpp is compatible with the corresponding change
> at e8ee0100.

I think it is OK. What about the users of mathedSymbolDim in 
InsetMathFrac? Is kerning irrelevant here?

JMarc