New submission from Terry J. Reedy <tjre...@udel.edu>:

Dependency of #33396. 

1. Base the initial font sizes on the on the configured editor font size.  Note 
that editor font size defaults to 10 while the current base size is 12.  I did 
not find any explicit discussion of this in the original issue, #16893, or the 
first followup, #25198.  Perhaps Mark Roseman just liked the result, or perhaps 
it made the relative sizing easier.

2. Change font size with Control-Mousewheel.  Manually tested code for doing 
this on Windows, Linux, and MacOS is in turtledemo.__main__.  The three systems 
are wildly different.  What we do here should allow easily doing same for other 
text windows.

----------
assignee: terry.reedy
components: IDLE
messages: 315985
nosy: terry.reedy
priority: normal
severity: normal
stage: patch review
status: open
title: IDLE help viewer: let users control font size
type: enhancement
versions: Python 3.6, Python 3.7, Python 3.8

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<https://bugs.python.org/issue33397>
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