[issue24781] Improve UX of IDLE Highlighting configuration tab

[Mark Roseman]

Mark Roseman added the comment:

cfg_highlight_alt.png shows with the listbox for choosing a theme

Also added highlight3.png... same kind of thing, but by renaming the tab as 'Themes' you no longer even need the row of labels at the top. And it parallels the fonts/tabs design suggestion somewhat too.

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Added file: http://bugs.python.org/file40111/highlight3.png

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<http://bugs.python.org/issue24781>
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