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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

On X11 <Button-4> and <Button-5> events are generated on mouse wheel roll. So you should add

        widget.bind('<Control-Button-4>', self._increaseFont)
        widget.bind('<Control-Button-5>', self._decreaseFont)

But mouse wheel events still are sent to widget and text is scrolled together with font size changing.

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