Strange behaviour of "expand" in CAS view (Xcas problem?)

[parisse]

Ok, I see. I was testing with the commandline version (giac) not with Xcas, because the commandline version is more suited to debugging.
I will modify expand not to collect if the coefficients are not exactly the same (currently it is comparing the difference to 0, and epsilon is used for doubles, but it's the null context epsilon, not updated by modifying epsilon in the settings).