[issue46996] Drop support of Tcl/Tk older than 8.5.12

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Ronald: According to a page (which I cannot find, E. Paine should know) Centos 7 has the oldest tcl among current *nix distributions.  
https://centos.pkgs.org/7/centos-x86_64/tcl-8.5.13-8.el7.x86_64.rpm.html
says it is 8.5.13, which is what I remember from the comparison page.

Serhiy: IDLE has required TkVersion >= 8.5 for some years (currently top of pyshell.py).  Does the _tkinter.c line
  #error "Tk older than 8.5.12 not supported"
translate into an ImportError (which is already caught).  I never worried about someone trying to import 8.3 or before, but Apple's 8.5.9 is possible.

Is there any reason that IDLE might someday require 8.6 before tkinter does?

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nosy: +terry.reedy

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