[issue31493] IDLE cond context: fix code update and font update timers

[Cheryl Sabella]

Cheryl Sabella added the comment:

Sorry, I didn't see this until now.

I added a line to editor.py in #31529 for this error message.  In _close() in editor.py, self.text was being set to None which wasn't calling the __del__ function of multicall.  I added a line to unbind "<<toggle-code-context>>", which made the error go away.  I don't know if that's the proper fix or not, but it seemed the error was occurring because the `after` wasn't being removed at the right time.

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nosy: +csabella

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<https://bugs.python.org/issue31493>
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