Thanks for the patch. I don't have time to review right away.
It's me FKtPp ;) writes:
BTW, Do you know why don't setnu.el use (featurep 'xemacs)
#'foundp some-extend-related-thing? A way to backward-compatible?
Because in general it's better to look for what you need rather than
depend on version information. (In Python this is called
"duck-typing": determining the type of an object by the APIs it
provides. From the proverb, "if it looks like a duck and quacks like
a duck, then it is a duck.")
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