Please put the definition of unfocus-frame back in.
It should not be removed in this release.
So yeah, probably there wasn't a
byte-compiler warning on 21.1 saying `unfocus-frame' was obsolete; but
the function *was* obsolete anyway and suitable replacements had been
introduced (and, I presume, documented).
You mustn't presume such a thing.
The fact is, this function had become a no-op. There was no
"replacement". But with nothing to call programmers' attention to the
unnecessary calls, they probably didn't remove them. I am sure there
are many programs that still call this function.
In this release, it should only get a warning. We can remove it in
23.1.
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