Terry J. Reedy <tjre...@udel.edu> added the comment:

When the question of changing default-x.def has come up before (and there are 
things I would like to change) the answer has generally been that we should 
not, a) because it would be too disruptive, including affecting exiting 
customizations, and b) because users already have the option of customizing.  
Most of the behaviors we change are not customizable, so we have to change the 
current behavior to give most people a better behavior, even if some people 
(including Raymond) object.

However, I will reconsider here since a) Tal, who I believe choose the current 
default, not only agrees with changing it by also the direction, b) 
line-numbers are only a year old, and, importantly, c) themes are saved as a 
whole, rather than as individual pairs, so that existing customizations will 
not be affected.  Even so, I expect that there will be people using IDLE 
Classic that prefer the current default.

If we are to change, we need specific foreground and background RGB numbers to 
replace the Current ones.  Raymond, Tal, and Cheryl if you want, please play 
with the line number (and future Shell sidebar) colors and propose something 
specific for general use.  (Raymond, I can imagine that you might prefer for 
projection with a particular system something different than you think is best 
for default screen use.)  I intend to post to idledev and maybe elsewhere to 
get other opinions (including for IDLE Dark).  Since I will not use whatever is 
chosen, my main concern is that we not choose something so light as to be 
unreadable by people like me with less than 'perfect' vision.

Related issue: the IDLE New theme was added years ago as a copy of IDLE 
Classic.  I presume the intent was to provide an alternative (light) default, 
but it was never modified, making it currently useless.  We should either 
delete it, while recognizing the name, or actually change it.  I have some 
ideas for the latter, but I presume Raymond intends this issue to be about 
changing IDLE Classic.

----------
nosy: +cheryl.sabella
resolution: not a bug -> 
stage: resolved -> 
status: closed -> open

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40856>
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