Message 297692 - Python tracker

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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.