[issue21597] Allow turtledemo code pane to get wider.

[Terry J. Reedy]

Terry J. Reedy added the comment:

Great improvement. Full screen on my system, the artifact ghosting band is about 1/4 inch, as with the empty panes, instead of several inches, as it was in the original patch moving right to left. This worst-case (Windows) behavior is good enough to commit when I recover enough from a minor eye injury to read and review the actual code. 

The one thing I think this patch still needs is a notice to the user that the sash can be moved. Once place is one of the help files. I can do that. Can we also put a line in the text box on startup?
"Change text pane width by moving the divider ==>"

With wider text panes, the tiny font, which is too small for my less than perfect, uninjured, 'normal' vision, is no longer necessary. Lita, feel free to open another issue and start on a patch. I think the best option be to have control-mousewheel change size, as is standard in browsers. (And add help text.) 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.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21597>
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