New submission from Terry J. Reedy:

As part of #30777, Cheryl Sabella listed Variables defined for a tab page, and 
the use thereof, in the docstring for the tab page.  This revealed some 
anomalies.

Duplicate: font_name is defined on font and highlight pages.  The first 
StringVariable should be attached to a widget before the name is rebound.  We 
should investigate after there are tests for the two pages.

Unused: for anything deleted, make sure that there is no corresponding trace 
function left.

binding_target (keys) sounds like something that was never an external option 
but just an internal implementation detail; delete.

encoding (general) *is* an external option, but I believe used only by 2.x.  
Recheck (in config.py also) and probably delete.

user_help_browser and help_browser (general) may have once been options.  We 
now use the system browser, which, at least on some systems, users can set.  
Delete.

----------
assignee: terry.reedy
components: IDLE
messages: 297692
nosy: csabella, terry.reedy
priority: normal
severity: normal
stage: needs patch
status: open
title: IDLE: configdialog -- fix tkinter Variables
type: behavior
versions: Python 3.6, Python 3.7

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<http://bugs.python.org/issue30851>
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