[issue6739] IDLE: refuse invalid key bindings

[Cheryl Sabella]

Cheryl Sabella added the comment:

I've made a PR for the patch.

Even though other tests need to be added, I only added a test for the call to sequence_ok().  Testing this by itself will probably allow it to be mocked in other tests.

I also added a call to the unittest in config_key.py.

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nosy: +csabella

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