[RF] Make it clear when to use RooSimultaneous::generateSimGlobal #17638
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More details in the comments in the code added in this commit.
To make it short: the user probably wants to use
generateSimGlobal
when not generating the index category value (or taking it from a proto
dataset), and
RooAbsPdf::generate()
otherwise.To avoid confusion, there are now new errors when one does the opposite,
which is certainly a user error.
Revert also the commit where I deprecated
generateSimGlobal
for a lack of a real understanding of its purpose.Thanks to @TomasDado for pointing out that it's still needed, and for privately providing a code example where it's necessary.