[issue17642] IDLE add font resizing hot keys and wheel

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

#33397 add a FontSizer class to textview.py and uses it there and for the doc viewer in help.py.  It should be used for this issue also.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17642>
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