Fix the compatibility of IPython 9.0+

[cxzhong]

sagemath/sage#41926

[mantepse]

This seems to work, but I don't understand it. I tried:

sage: import IPython
sage: ip = IPython.get_ipython()
sage: ip.complete("Bi")
('Bi',
 ['Bialgebras',
  'BialgebrasWithBasis',
  'Bijectionist',
  'Bilder/',
  'Bimodules',
  'BinaryQF',
  'BinaryQF_reduced_representatives',
  'BinaryRecurrenceSequence',
  'BinaryStrings',
  'BinaryTree',
  'BinaryTrees',
  'BipartiteGraph',
  'Bitset'])

so it seems it would strip the first two letters from every result - but it doesn't! Do you know why?

[cxzhong]

# Old IPython: ip.complete("ZZ.") → ('ZZ.', ['ZZ.CartesianProduct', ...])
# len("ZZ") + 1 = 3, strip 3 from 'ZZ.CartesianProduct' → 'CartesianProduct' 

# IPython 9.x: ip.complete("ZZ.") → ('.', ['.CartesianProduct', ...])
# len("ZZ") + 1 = 3, strip 3 from '.CartesianProduct' → 'rtesianProduct' 

Seems like this

[mantepse]

Sorry, I was not clear. The example above is with IPython 9.12.0!

sage: import IPython
sage: ip = IPython.get_ipython()
sage: ip.complete("Bij")
('Bij', ['Bijectionist'])
sage: ip.complete("Bi")
('Bi',
 ['Bialgebras',
  'BialgebrasWithBasis',
  'Bijectionist',
  'Bilder/',
  'Bimodules',
  'BinaryQF',
  'BinaryQF_reduced_representatives',
  'BinaryRecurrenceSequence',
  'BinaryStrings',
  'BinaryTree',
  'BinaryTrees',
  'BipartiteGraph',
  'Bitset'])
sage: IPython.__version__
'9.12.0'
sage: ip.complete("Bijectionist.")
('.',
 ['.category',
  '.constant_blocks',
  '.dump',
  '.dumps',
  '.get_custom_name',
  '.minimal_subdistributions_blocks_iterator',
  '.minimal_subdistributions_iterator',
  '.parent',
  '.possible_values',
  '.rename',
  '.reset_name',
  '.save',
  '.set_constant_blocks',
  '.set_distributions',
  '.set_homomesic',
  '.set_intertwining_relations',
  '.set_quadratic_relation',
  '.set_semi_conjugacy',
  '.set_statistics',
  '.set_value_restrictions',
  '.solutions_iterator',
  '.statistics_fibers',
  '.statistics_table'])