[issue27821] IDLE custom keymaps don't work anymore (Windows, Python 3.6.0a3)

[Terry J. Reedy]

Terry J. Reedy added the comment:

Vedran, I have used IDLE's imperfect visual debugger and was thinking about how I might use it to solve this problem.  But I have never used pdb.  Perhaps I should learn it.  Please explain how you used set_trace to track down this bug.

For #24265, I have similarly analyzed some of the top-level calls and believe I know the problem -- a missing function call -- but where?  I think I need to trace both what does not work and something similar that does work and compare execution paths.  How could I use pdb for this issue?

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<https://bugs.python.org/issue27821>
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