Bug in scalar products of characters coming from restrictions

[Peter Mueller]

In the code below  g1 and g2 are the same group, where g2 is produced as a subgroup of g1, and c is the principal character of g1. Still, when it comes to scalar products, somehow g1 is not considered as a subgroup of itself:

sage: g1 = SymmetricGroup(2)

....: g2 = g1.conjugacy_classes_subgroups()[-1]

....: c = g1.trivial_character()

....: 

....: def test(h):

....:     try:

....:         x = c.restrict(h)

....:         y = h.trivial_character()

....:         print('x == y?:', x == y)

....:         return x.scalar_product(y)

....:     except:

....:         return 'GAPError'

....: g1 == g2

....: [test(g2), test(g1)]

....: 

True

x == y?: True

x == y?: True

[1, 'GAPError']