Message 190383 - Python tracker

#12520 deleted _find_constructor in 3.x as it works with, but only with old-style classes (gone in 3.x) and just uses getattr(ob, '__init__', None). I believe the tests in this patch duplicate existing tests at the bottom of CallTips.py (increased from 10 to 30 as part of #12510). I will recheck when I move the existing tests into the new idle_test/test_calltips.py.