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

[Terry J. Reedy]

Terry J. Reedy added the comment:

The underlying issue is trying to coordinate two somewhat independent object systems (Python and Tcl).  I don't know why the after loops were (apparently) stopped before #27099 and not after.  The only difference I know of is the dropping of the reference to CodeContext instances in .unload_extensions, called from ._close.  CodeContext did not have a .close method.

I tried the first thing I thought might work and it did, so I stopped.  I don't know why unbinding the toggle function was enough.  I expect that we will eventually review ._close.  It should help when the menu and editor are separated a bit.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31493>
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