@Serhiy

IDLE places its default configuration files within the standard library. Any upgrade of Python can modify the contents of the standard library. Even if we do *nothing* to change Lib/idlelib/config-main.def, the next upgrade would overwrite an end users custom print command anyway.

Now, if the end-user changed ~/.idlerc/config-main.cfg instead to include the new "print-command-posix" entry then this patch will not change their custom setting.