bug#58278: Add new function seq-keep

[Robert Pluim]

>>>>> On Tue, 04 Oct 2022 12:13:55 +0200, Lars Ingebrigtsen <larsi@gnus.org> 
>>>>> said:

    Lars> Robert Pluim <rpluim@gmail.com> writes:
    >> How is this different from 'cl-mapcan'? (apart from the syntactic sugar)

    Lars> I don't see how seq-keep would resemble cl-mapcan much?

Well, cl-mapcan applies a function to the elements of a sequence and
discards 'nil' results. Looks pretty similar to me.

Robert
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