[issue20917] Idle: Enhance font change notification system

[Terry J. Reedy]

Terry J. Reedy added the comment:

I believe I saw somewhere that the 'somehow' in the opening post is looping through the windows listed under the Window tab.

This issue was inspired by #17642, which allows hotkeys (^-, ^+) and wheel to change font size in editor window.  If the size change only applies to the current window, then only the CodeContext for that window should be notified.  If CodeContext becomes a feature rather than extension, #27099, then code editor windows could know they have a code context and notify it when they get notified.  That will not help external extensions.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20917>
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