[issue21933] Allow the user to change font sizes with the text pane of turtledemo

[Lita Cho]

New submission from Lita Cho:

Currently, the turtledemo doesn't allow you to change font sizes of the demo code, and the default font size is really small.

I can work on creating a patch to fix this. Best option be to have control-mousewheel change size, as is standard in browsers, as well as Ctrl + and Ctrl - to change sizes (since laptops don't have a mousewheel). 

If tk has a problem with that, a second choice would be a menu entry "Font size with choices such as the current size (9?), 10, 12, 14.

Also, update the Help Text of this new feature.

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messages: 222466
nosy: Lita.Cho, jesstess, ned.deily, terry.reedy
priority: normal
severity: normal
status: open
title: Allow the user to change font sizes with the text pane of turtledemo
versions: Python 2.7, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21933>
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